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El tratamiento de la alergia a las proteínas de la leche de vaca se basa en la eliminación completa de las proteínas de leche de vaca de la dieta del niño y de la madre en los que reciben leche materna. Para lograr la remisión de los síntomas y la tolerancia futura, la exclusión debe ser total. En los niños que reciben fórmula, esta deberá tener hidrolizado extenso de proteínas en las formas leves o moderadas, mientras que aquellas a base de aminoácidos se reservan para los casos más graves. El tiempo de tratamiento, la adquisición de tolerancia y el momento para la prueba de provocación oral van a variar según el cuadro clínico, el mecanismo inmunológico implicado y la edad del paciente. El objetivo de este consenso ha sido reflejar el conocimiento actualizado junto con la experiencia de neonatólogos, pediatras, especialistas en alergia, nutrición y gastroenterología.

The treatment of cow's milk protein allergy is based on the complete elimination of cow's milk protein from the diet. To achieve remission of symptoms and future tolerance, exclusion must be total. In formula fed infants the extensively hydrolysed formula is the most appropriate option in mild or moderate forms, while those based on amino acids are reserved for the most severe cases. The treatment time, the acquisition of tolerance and the moment for the oral provocation test will vary according to the clinical picture, the immunological mechanism involved and the age of the patient. The aim of this consensus has been to reflect the updated knowledge together with the experience of neonatologists, pediatricians, experts in allergy, nutrition and gastroenterology

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Las proteínas de la leche de vaca pueden causar alergia alimentaria. Los distintos mecanismos de acción involucrados y la variabilidad clínica según la etapa de la vida pediátrica en la que se manifieste ocasionan dificultades en su abordaje, con riesgo de sub- o sobrediagnóstico. En este proceso, intervienen profesionales de diversas áreas y es recomendable su interacción. Es por ello que el objetivo de este consenso ha sido reflejar el conocimiento actualizado desde la interdisciplina, generando recomendaciones para su correcto diagnóstico. Hemos trabajado con el método de Delphi para sumarle a la evidencia científica, la experiencia proveniente de neonatólogos, pediatras, especialistas en alergia, nutrición y gastroenterología. Pensamos que este enfoque interdisciplinario de trabajo va a resultar de utilidad práctica y promoverá una atención más integral de estos pacientes.

Cow's milk protein can cause food allergy. The different mechanisms of action involved, the clinical variability depending on the stage of pediatric life in which it manifests, leads to difficulties in its approach, with the risk of under- or over-diagnosis. Professionals from various areas intervene in this process and their interaction is recommended. That is why the objective of this consensus has been to reflect the updated knowledge in an interdisciplinary mode, generating recommendations for its correct diagnosis. We have worked with the Delphi method to add to the scientific evidence, the experience from neonatologists, pediatricians, experts in allergy, nutrition and gastroenterology. We think that this interdisciplinary approach will be of practical use and will promote more comprehensive care for these patients.

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The treatment of cow's milk protein allergy is based on the complete elimination of cow's milk protein from the diet. To achieve remission of symptoms and future tolerance, exclusion must be total. In formula fed infants the extensively hydrolysed formula is the most appropriate option in mild or moderate forms, while those based on amino acids are reserved for the most severe cases. The treatment time, the acquisition of tolerance and the moment for the oral provocation test will vary according to the clinical picture, the immunological mechanism involved and the age of the patient. The aim of this consensus has been to reflect the updated knowledge together with the experience of neonatologists, pediatricians, experts in allergy, nutrition and gastroenterology.

El tratamiento de la alergia a las proteínas de la leche de vaca se basa en la eliminación completa de las proteínas de leche de vaca de la dieta del niño y de la madre en los que reciben leche materna. Para lograr la remisión de los síntomas y la tolerancia futura, la exclusión debe ser total. En los niños que reciben fórmula, esta deberá tener hidrolizado extenso de proteínas en las formas leves o moderadas, mientras que aquellas a base de aminoácidos se reservan para los casos más graves. El tiempo de tratamiento, la adquisición de tolerancia y el momento para la prueba de provocación oral van a variar según el cuadro clínico, el mecanismo inmunológico implicado y la edad del paciente. El objetivo de este consenso ha sido reflejar el conocimiento actualizado junto con la experiencia de neonatólogos, pediatras, especialistas en alergia, nutrición y gastroenterología.

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Cow's milk protein can cause food allergy. The different mechanisms of action involved, the clinical variability depending on the stage of pediatric life in which it manifests, leads to difficulties in its approach, with the risk of under- or over-diagnosis. Professionals from various areas intervene in this process and their interaction is recommended. That is why the objective of this consensus has been to reflect the updated knowledge in an interdisciplinary mode, generating recommendations for its correct diagnosis. We have worked with the Delphi method to add to the scientific evidence, the experience from neonatologists, pediatricians, experts in allergy, nutrition and gastroenterology. We think that this interdisciplinary approach will be of practical use and will promote more comprehensive care for these patients.

Las proteínas de la leche de vaca pueden causar alergia alimentaria. Los distintos mecanismos de acción involucrados y la variabilidad clínica según la etapa de la vida pediátrica en la que se manifieste ocasionan dificultades en su abordaje, con riesgo de sub- o sobrediagnóstico. En este proceso, intervienen profesionales de diversas áreas y es recomendable su interacción. Es por ello que el objetivo de este consenso ha sido reflejar el conocimiento actualizado desde la interdisciplina, generando recomendaciones para su correcto diagnóstico. Hemos trabajado con el método de Delphi para sumarle a la evidencia científica, la experiencia proveniente de neonatólogos, pediatras, especialistas en alergia, nutrición y gastroenterología. Pensamos que este enfoque interdisciplinario de trabajo va a resultar de utilidad práctica y promoverá una atención más integral de estos pacientes.

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Objective: Multiple sclerosis (MS) may include not only severe neurological signs and symptoms, but also cognitive and psychiatric disturbances. When psychiatric symptoms precede or are comorbid with MS, it poses a clinical challenge, because it may lead to a mistaken diagnosis of MS as a psychiatric disorder, delaying proper treatment. We describe the neuropsychological profile of a female patient with MS whose diagnosis was delayed due to neuropsychiatric symptoms. Method: A comprehensive analysis of the medical history and the results of a teleneuropsychological assessment of a 36-year-old Mexican woman with a diagnosis of relapsing--remitting MS (RRMS) was performed. Results: The patient indicates a long history of psychotic, anxious, and depressive features years before the first neurological symptom that led to MS going unnoticed for several years. Language, attentional, perceptual, motor, and learning skills were found to be preserved. Short-term memory and spatial orientation problems were identified, with decreased processing speed and executive dysfunction, including working memory and planning deficits. Conclusions: The patient has a non-typical presentation of neuropsychological alterations with cognitive and behavioral symptoms that resemble dorsolateral frontal lobe syndrome. This case study highlights the importance of considering MS in differential diagnosis of patients with psychiatric symptoms, even in the absence of obvious neurological signs.

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INTRODUCTION: The use of teleneuropsychology (TeleNP) increased as a result of the COVID-19 pandemic; however, there have been no studies of the benefits and difficulties with this modality in middle-income countries. This study aimed to assess the current use of TeleNP in Mexico. METHOD: Mexican neuropsychologists were invited to participate in an online survey regarding the use of TeleNP during the COVID-19 pandemic. The survey was based on issues from a literature review and consisted of 36 questions requiring yes/no, multiple choice, or ordinal answers. The survey was created using Google Forms and asked respondents to provide informed consent. A total of 107 clinical neuropsychologists completed the survey. RESULTS: 82% of participants currently use TeleNP, and most reported learning about TeleNP through personal experience, literature research, and colleagues. Brief evaluations, delivery of results, and intervention were the principal services provided, most frequently on a home-to-home basis. Almost 30% of clinicians reported not requiring informed consent for use of the modality. Consultations included children, adolescents, and adults in similar numbers; older adults were less frequent. Technological limitations were the most frequent reason for ruling out the modality with particular patients. Perceived benefits included the ability to continue consultations despite social distancing measures, lesser risk of COVID-19 infection, and the possibility of seeing patients with limited access to neuropsychological services. Reasons for not using TeleNP included a lack of standardized instruments, not feeling comfortable with the modality, and lack of technological resources and skills. CONCLUSIONS: Despite the socioeconomic differences between Mexico and high-income countries, most of our findings were similar to reports from those countries. However, technological limitations were common, and smartphones were commonly used, contrary to recommendations in the literature. The future use of TeleNP in Mexico should include formal training and ethical guidelines.

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BACKGROUND: The true prevalence of Chagas disease in Mexico is unknown. However, it has been estimated that 1.1-4 million people are infected with Trypanosoma cruzi, which represents a potential risk for transmission of the disease via contaminated blood. AIM OF THE STUDY: To determine the Chagas disease seroprevalence in donors from eight blood banks in the north of Mexico City, and the northeast of the State of Mexico. STUDY DESIGN AND METHODS: Serum samples from blood donors (n = 515,038) were tested to detect the presence of anti-Trypanosoma cruzi antibodies in eight blood banks. The serologic screening test was performed in each of the blood banks. To confirm the seropositive blood donors, only two out of the eight blood banks used a test with a different principle with the aim of identifying anti-Trypanosoma cruzi antibodies. All tests were validated by the Mexican Institute for Epidemiological Diagnosis and Reference. RESULTS: One thousand two hundred and ten blood donors were seropositive for Trypanosoma cruzi, which represents a 0.23% seroprevalence (95% CI 0.22-0.25%). Of the seropositive blood donors, 97.03 % resided in the northeast area of the State of Mexico, Mexico City, and southern part of the State of Hidalgo. CONCLUSIONS: Active transmission of Chagas disease may be occurring in non-endemic regions in the northeast of the State of Mexico.

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The CatSper channel localizes exclusively in the flagella of sperm cells. The Catsper1 protein, together with three pore units, is essential for the CatSper Channel formation, which produces flagellum hyperactivation and confers sperm fertility. Catsper1 expression is dependent on Sox transcription factors, which can recognize in vitro at least three Sox binding sites on the promoter. Sox transcription factors have calmodulin-binding domains for nuclear importation. Calmodulin (CaM) is affected by the specific inhibitor calmidazolium (CMZ), which prevents the nuclear transport of Sox factors. In this work, we assess the regulation of the Catsper1 promoter in vivo by Sox factors in the murine testis and evaluate the effects of the inhibitor calmidazolium on the expression of the Casper genes, and the motility and fertility of the sperm. Catsper1 promoter has significant transcriptional activity in vivo; on the contrary, three Sox site mutants in the Catsper1 promoter reduced transcriptional activity in the testis. CaM inhibition affects Sox factor nuclear transport and has notable implications in the expression and production of Catsper1, as well as in the motility and fertility capability of sperm. The molecular mechanism described here might conform to the basis of a male contraceptive strategy acting at the transcriptional level by affecting the production of the CatSper channel, a fundamental piece of male fertility.

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BACKGROUND: The 2020 pandemic of SARS-CoV-2 causing COVID-19 disease is an unprecedented global emergency. COVID-19 appears to be a disease with an early phase where the virus replicates, coinciding with the first presentation of symptoms, followed by a later 'inflammatory' phase which results in severe disease in some individuals. It is known from other rapidly progressive infections such as sepsis and influenza that early treatment with antimicrobials is associated with a better outcome. The hypothesis is that this holds for COVID-19 and that early antiviral treatment may prevent progression to the later phase of the disease. METHODS: Trial design: Phase IIA randomised, double-blind, 2 × 2 design, placebo-controlled, interventional trial. RANDOMISATION: Participants will be randomised 1:1 by stratification, with the following factors: gender, obesity, symptomatic or asymptomatic, current smoking status presence or absence of comorbidity, and if the participant has or has not been vaccinated. BLINDING: Participants and investigators will both be blinded to treatment allocation (double-blind). DISCUSSION: We propose to conduct a proof-of-principle placebo-controlled clinical trial of favipiravir plus or minus nitazoxanide in health workers, their household members and patients treated at the Mexican Social Security Institute (IMSS) facilities. Participants with or without symptomatic COVID-19 or who tested positive will be assigned to receive favipiravir plus nitazoxanide or favipiravir plus nitazoxanide placebo. The primary outcome will be the difference in the amount of virus ('viral load') in the upper respiratory tract after 5 days of therapy. Secondary outcomes will include hospitalization, major morbidity and mortality, pharmacokinetics, and impact of antiviral therapy on viral genetic mutation rate. If favipiravir with nitazoxanide demonstrates important antiviral effects without significant toxicity, there will be a strong case for a larger trial in people at high risk of hospitalization or intensive care admission, for example older patients and/or those with comorbidities and with early disease. TRIAL REGISTRATION: ClinicalTrials.gov NCT04918927 . Registered on June 9, 2021.

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Noise affects the recognition of acoustic signals by masking information. To compensate for increased noise, individuals often increase the minimum frequency of their vocalization to reduce noise interference. Our goal was to analyze the effect of noise on the characteristics of different bird vocalizations, through a comparative study of vocalizations on the same bird species. We analyzed the effects of noise variation on the fine spectrotemporal characteristics of calls, songs, and duets of White-eared Ground-sparrows (Melozone leucotis) across three populations over a three-year period. We recorded vocalizations and noise levels simultaneously from 41 territories between 2012 and 2014. We measured the duration, minimum, maximum, and maximum amplitude frequency, and counted the number of songs elements for each vocalization recorded. As we predicted, noise influences the minimum frequency of song, but did not have an effect on the fine spectrotemporal characteristics for calls and duets. We did, however, find that low and high frequency of calls and duets increased with noise-population-year interaction. Our results suggest that differences in noise values at each population were inadequate to observe changes in vocalization characteristics. In conclusion, evaluating responses to different noise levels on different vocalization types for the same species expands our understanding of the flexibility of birds to adjust vocalizations in response to anthropogenic noise.

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Abstract: Research on gingival health of 12-year-old schoolchildren in Costa Rica is scarce. Since nutrition is an integral component of oral health, this study aimed to determine gingival status of 12-year-olds at Carmen Lyra Public School, San José, Costa Rica, and correlate these variables with the frequency of intake of different types of food and body mass index (BMI (kg/m2)). Sixty-two 12-year-old schoolchildren were recruited. A periodontist assessed Plaque Index (Silness and Löe,1964), presence of calculus, and Gingival Index (Löe and Silness, 1967). Gingivitis was defined as the presence of bleeding on probing (BOP) on at least one site, and the extent was classified according to the percentage of teeth whose gingiva presented BOP limited: 25-49% of teeth tested; extensive >50% of teeth tested. A semi-quantified food consumption frequency questionnaire was administered. BMI was calculated for each participant. Overall Plaque Index was 1.18. Calculus was present on 40.40% of the sample, 19.4% had supragingival calculus and 21% had either supragingival/subgingival calculus or both. Presence of calculus was related with number of bleeding surfaces (p=0.030). Number of teeth with calculus was related to bleeding(p=0.029), and number of bleeding surfaces (p=0.009). Gingival Index was 0.97, mild gingivitis. Gingivitis was present on 96.8% of children examined. Limited gingivitis was present in 11.5% of children and extensive gingivitis in 88.5%. None of the variables measured differed by gender. No relationships were found between the consumption of starchy foods, animal and vegetable protein sources, fruit, vegetables, fast foods, sugar sweetened beverages and desserts with Plaque Index, calculus, Gingival Index, and BOP. Teeth calculus was related with being overweight (chi- square=0.038). BMI for males was 20.21 and females 20.11. BMI was not related to BOP or calculus. Within the limitations of this pilot study, we concluded the prevalence of gingivitis and calculus is high in the sample examined. A greater sample is needed to determine correlations between the frequency of foods evaluated and gingival health.

Resumen: La investigación sobre la salud gingival en escolares de 12 años en Costa Rica es escasa. Dado que la nutrición es un componente integral de la salud oral, este estudio tuvo como objetivo determinar el estado de salud gingival de los niños de 12 años de la escuela Carmen Lyra, San José, Costa Rica, y correlacionar estas variables con la frecuencia de ingesta de diferentes tipos de alimentos y el índice de masa corporal (IMC (kg/m2)). Sesenta y dos escolares de 12 años fueron reclutados. Una periodoncista calibrada, evaluó el índice de placa (Silness y Löe, 1964), la presencia de cálculo y el índice gingival (Löe y Silness, 1967). La gingivitis se definió como la presencia de sangrado al sondaje en al menos un sitio. La extensión se clasificó de acuerdo con el porcentaje de dientes que presentaba sangrado al sondaje. Entre un 25-49% de los dientes con sangrado al sondaje, gingivitis limitada y extensiva, si presentaba más del 50% de dientes con sangrado al sondaje. Se administró un cuestionario de frecuencia de consumo de alimentos. El IMC se calculó para cada participante. El índice de placa fue de 1,18. El cálculo estuvo presente en el 40.40% de la muestra, el 19.4% tenía cálculo supragingival y el 21% tenía cálculo supragingival / subgingival o ambos. La presencia de cálculo se relacionó con el número de superficies sangrantes (p=0.030). El número de dientes con cálculo, se relacionó con el sangrado (p=0.029) y el número de superficies sangrantes (p=0.009). El índice gingival fue de 0.97, gingivitis leve. La gingivitis estuvo presente en el 96,8% de los niños examinados. La gingivitis limitada estuvo presente en el 11.5% de los niños y la gingivitis extensa en el 88.5%. Ninguna de las variables evaluadas difirió por género. No se encontraron relaciones entre el consumo de harinas, fuentes de proteínas animales y vegetales, frutas, verduras, comidas rápidas, bebidas azucaradas y postres con el índice de placa, cálculo, índice gingival y sangrado al sondaje. El cálculo se relacionó con el sobrepeso (chi-cuadrado=0.038). El IMC para los hombres fue 20.21 y las mujeres 20.11. El IMC no estaba relacionado con el sangrado al sondaje o cálculo. Dentro de las limitaciones de este estudio piloto, concluimos que la prevalencia de gingivitis y cálculo es alta en la muestra examinada. Se necesita una muestra mayor para determinar las correlaciones entre la ingesta de los diferentes tipos de alimentos evaluados y la salud gingival.

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Resumen Introducción: una de las preocupaciones existentes como política de Estado es el embarazo adolescente. Para ello se considera la anticoncepción como una de las estrategias para prevenirlo y por ello surge el cuestionamiento sobre los criterios y lineamientos para la anticoncepción en la adolescencia. Materiales y métodos: se trata de una investigación documental. Resultados: la literatura que existe al respecto aborda la cuestión desde una perspectiva de garantizar el acceso a la anticoncepción por parte de menores de edad, sin otro criterio distinto a que sea una decisión autónoma; lo mismo ocurre con la reglamentación que existe al respecto. Desde la bioética de protección se identifican otros elementos que permiten establecer los lineamientos en cuanto a la valoración ética y a los parámetros que se deben tener por la legislación. Conclusiones: la anticoncepción en menores de edad requiere de especial atención desde un enfoque multifactorial y no solamente desde una perspectiva de libre acceso.

Abstract Introduction: the adolescent pregnancy is a matter of concern as a State policy. The contraception is one of the strategies used to prevent that scourge, so, it is necessary to ask about guidelines and standards to use contraception in adolescents. Materials and Methods: this is a documentary research. Results: the existing literature addresses this topic from the perspective of guaranteeing access to contraception by minors, with no other criterion than their autonomous decision; the same happens to the existing regulations in this regard. From the bioethics of protection other elements are identified that allow establishing the guidelines regarding the ethical assessment and the parameters that must be taken by the legislation. Conclusion: the contraception in minors needs special attention from a multifactorial approach and not only from the perspective of free access.

Resumo Introdução: uma das preocupações existentes como política de Estado é com a gravidez na adolescência. Por essa razão, considera-se a anticoncepção como uma das estratégias de prevenção. No entanto, surge a questão sobre quais critérios utilizar para o planejamento da anticoncepção na adolescência. Materiais e métodos: trata-se de uma pesquisa documental. Resultados: a literatura existente, que trata da questão, faz isso da perspectiva da garantia do acesso à anticoncepção por parte de menores de idade sem outro critério que não sej a o da decisão autônoma. O mesmo acontece com a regulamentação que existe a esse respeito. A partir da bioética da proteção, são identificados outros elementos que permitem estabelecer diretrizes sobre a avaliação ética e os parâmetros que devem ser adotados pela legislação. Conclusões: a anticoncepção em menores de idade exige uma atenção especial desde um enfoque multifactorial, e não só da perspectiva de acesso livre a métodos anticonceptivos.

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 173 Mexicans from the state of Chiapas living in the city of Tuxtla Gutiérrez (N = 52) and rural communities (N = 121), to obtain information regarding allelic and haplotypic frequencies. We found that the most frequent haplotypes in Chiapas include 12 Native American and one European haplotype. Admixture estimates revealed that the main genetic components in Chiapas are Native American (71.61 ±â€¯0.58% by ML; 53.16% of Native American haplotypes) and European (26.39 ±â€¯5.05% by ML; 25.86% of European haplotypes), and a less prominent African genetic component (2.00 ±â€¯5.20% by ML; 9.77% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 148 Mexicans from the state of Tamaulipas living in Ciudad Victoria (N = 23) and rural communities (N = 125), to obtain information regarding allelic and haplotypic frequencies. We found that the most frequent haplotypes in the state of Tamaulipas include ten Native American, three European and one African haplotypes. Admixture estimates revealed that the main genetic components in the state of Tamaulipas are Native American (54.69 ±â€¯0.93% by ML; 47.65% of Native American haplotypes) and European (34.66 ±â€¯5.62% by ML; 33.56% of European haplotypes), and a relatively high African genetic component (10.65 ±â€¯5.05% by ML; 12.42% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 122 Mexicans from the state of Hidalgo living in the city of Pachuca (N = 41) and rural communities (N = 81), to obtain information regarding allelic and haplotypic frequencies. We find that the most frequent haplotypes in Hidalgo include eight Native American and one European haplotypes. Admixture estimates revealed that the main genetic components in Hidalgo are Native American (58.93 ±â€¯2.16% by ML; 54.51% of Native American haplotypes) and European (32.49 ±â€¯2.88% by ML; 28.69% of European haplotypes), and a relatively high African genetic component (8.58 ±â€¯0.93% by ML; 6.97% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 1113 Mexicans from the state of Veracruz living in the cities of Coatzacoalcos (N = 55), Orizaba (N = 60), Córdoba (N = 56), Poza Rica (N = 45), Veracruz (N = 171), Xalapa (N = 187) and rural communities (N = 539) to obtain information regarding allelic and haplotypic frequencies. We found that the most frequent haplotypes include 12 Native American haplotypes. Admixture estimates revealed that the main genetic components are Native American (64.93 ±â€¯1.27% by ML; 55.10% of Native American haplotypes) and European (26.56 ±â€¯0.89% by ML; 28.38% of European haplotypes), and a relatively high African genetic component (8.52 ±â€¯1.82% by ML; 8.78% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 81 Mexicans from the state of Campeche living in the city of Campeche (N = 34) and rural communities (N = 47), to obtain information regarding allelic and haplotypic frequencies. We find that the most frequent haplotypes in the state of Campeche include ten Native American, three European, one African and one Asian haplotype. Admixture estimates revealed that the main genetic components in the state of Campeche are Native American (65.56 ±â€¯0.96% by ML; 51.24% of Native American haplotypes), European (34.44 ±â€¯10.94% by ML; 30.25% of European haplotypes), and a virtually absent African genetic component (0.00 ±â€¯10.31% by ML; 9.26% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 636 Mexicans from the state of Oaxaca living in the city of Oaxaca (N = 151) and rural communities (N = 485), to obtain information regarding allelic and haplotypic frequencies. We found that the 13 most frequent haplotypes in Oaxaca are all of putative Native American origin. Admixture estimates revealed that the main genetic components in the state of Oaxaca are Native American (73.12 ±â€¯2.77% by ML; 61.52% of Native American haplotypes) and European (17.36 ±â€¯2.07% by ML; 20.69% of European haplotypes), and a relatively high African genetic component (9.52 ±â€¯0.88% by ML; 8.94% of African haplotypes).

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We studied HLA class I (HLA-A, -B) and class II (HLA-DRB1, -DQB1) alleles by PCR-SSP based typing in 2827 Mexicans from the state of Puebla living in the city of Puebla (N = 1994) and rural communities (N = 833), to obtain information regarding allelic and haplotypic frequencies. We found that the 16 most frequent haplotypes in Puebla are all of them Native American. Admixture estimates revealed that the main genetic components in the state of Puebla are Native American (72.21 ±â€¯1.25% by ML; 63.30% of Native American haplotypes) and European (21.05 ±â€¯1.92% by ML; 23.86% of European haplotypes), and a less prominent African genetic component (6.74 ±â€¯2.20% by ML; 6.20% of African haplotypes).

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