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We report here the identification of three Cemi-A and four Cemi-B novel alleles of Cercopithecus mitis.

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A serological investigation by means of an enzyme immuno assay test for herpes B virus (cercopithecine herpesvirus 1) was performed on 961 sera of healthy nonhuman primates reared in laboratory animal facilities which belong to the Association of Laboratory Animal Facilities of the National University of Japan. An antibody prevalence of 40% (384/ 961) was demonstrated. The antibody titer was shown to be higher among macaques (60% of cynomolgus monkeys, 53% of rhesus monkeys, and 34% of Japanese monkeys) than among non-macaque species (21%). These data indicate that nonhuman primates reared in animal facilities may present an occupational health problem and a potential zoonotic biohazard as demonstrated in limited cases in the United States.

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In an attempt to generate a suitable animal model to study the infectivity and possible pathogenicity of human immunodeficiency viruses, we intravenously inoculated juvenile rhesus macaques and African green monkeys with a molecularly cloned virus, human immunodeficiency virus type 2 HIV-2sbl/isy, as well as with the uncloned HIV-2nih-z virus. Infection was monitored by virus recovery from the peripheral blood cells and by seroconversion against HIV-2 antigens measured by Western immunoblot, radioimmunoprecipitation, and enzyme-linked immunosorbent assay. We successfully infected two out of two macaques with the molecularly cloned virus and one macaque out of two with the HIV-2nih-z. No evidence of infection was seen in the African green monkeys with either virus. We followed the infected animals for 2 years. The animals remained healthy, although we observed intermittent lymphadenopathy and a transient decrease in the absolute number of circulating CD4+ T lymphocytes in both animals infected with the molecularly cloned virus. Virus isolation from the peripheral blood cells of the infected animals was successful only within the first few months after inoculation. Evidence of persistent infection was provided by the detection of proviral DNA by polymerase chain reaction analysis of the blood cells of the inoculated animals and by the stability of antiviral antibody titers. To evaluate the genetic drift of the proviral DNA, we molecularly cloned viruses which were reisolated 1 and 5 months postinoculation from one of these animals. Comparison of the DNA sequences of the envelope genes of both these isolates indicated that a low degree of variation (0.2%) in the envelope protein had occurred in vivo during the 5-month period. These data suggest that the use of HIV-2sbl/isy in rhesus macaques may represent a good animal model system to study prevention of viral infection. In particular, molecularly cloned virus can be manipulated for functional studies of viral genes in the pathogenesis of acquired immune deficiency syndrome and provides a reproducible source of virus for vaccine studies.

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Serum IgG, IgA, and IgM levels were measured in domestically bred African green monkeys (Cercopithecus aethiops) ranging in age from 0 day to 49 months as well as in adult (5 years or older) animals of wild origin. Transplacental transfer of IgG was observed. IgG, IgA, and IgM levels increased with increasing age except for a temporal decrease of IgG level in the first month of life.

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Antigenicity of IgG was compared among human, the cynomolgus monkey, the African green monkey and the squirrel monkey by the quantitative precipitation test using purified IgG of and rabbit anti-IgG serum to each species. Clear cross-antigenicity was observed between the cynomolgus monkey and the African green monkey and less clear cross-antigenicity between human and the cynomolgus monkey or the African green monkey. The cross-antigenicity observed between the squirrel monkey and the other three species examined was evidently weak.

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Mature T-cells were removed from Cercopithecus aethiops monkey bone marrow with Campath-1 MoAb plus complement from various species (man, rabbit and monkey). The T-cell depletion was more effective and stable with rabbit or human complement than with autologous (monkey) complement. The most complete and effective lytic function to T-cells was found in the case of rabbit complement. Rabbit complement can be used successfully to deplete bone marrow T-cells of C. aethiops with Campath-1 in vitro.

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Antibodies which probably indicate infection with human T-cell leukaemia virus type I (HTLV-I) were determined in three species of non-human primates from several localities. A significant prevalence among chacma baboons and vervet monkeys was confirmed. According to sero-epidemiological evidence that HTLV-I infection is predominantly sexually transmitted between adult animals; comparison of prevalence rates between localities or species should therefore take sexual maturity into account. It appears unlikely that transmission from non-human primates to humans is frequent.

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This study demonstrates that monkey esophagus is a more sensitive substrate than guinea pig esophagus for the demonstration of serum antibodies, in patients with pemphigus vulgaris. In this study, for example, five patients with active pemphigus who had demonstrable pemphigus antibodies on monkey esophagus substrate failed to demonstrate pemphigus antibody activity when guinea pig esophagus was employed as a substrate. Furthermore, pemphigus antibody titers determined on monkey esophagus substrate frequently exceeded, by several dilutions, titers detected with guinea pig esophagus. By contrast, in no instance did we detect pemphigus antibody titer activity on guinea pig esophagus in excess of the pemphigus antibody activity detected on monkey esophagus. The reason for the disparity in the sensitivity of the guinea pig and monkey esophagus substrates is unknown.

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The nontransmissibility of the Edmonston strain of measles virus was demonstrated by failure to transmit the virus by aerosol from vaccinated pups to susceptible cercopithecus monkeys. Monkeys in direct contact for 3 weeks remained clinically normal and serologically negative for measles virus antibody.

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Sera of humans and seven species of nonhuman primates were tested by radioimmunoassay and enzyme immunoassay for the presence of hepatitis A antibody, hepatitis B surface antigen and antibody to hepatitis B surface antigen. The outcome of testing a total of 276 serum or plasma specimens was as follows: with the exception of squirrel monkeys (0%) and cotton-top marmosets (0%), a considerable percentage of all other species tested had detectable antibodies to hepatitis A virus: humans 45.9%, chimpanzees 36.6%, baboons 38.2%, vervets 57.9%, cebus monkeys 40.0% and common marmosets 50.0%. Only one human and two chimpanzees were carriers of hepatitis B surface antigen. Antibodies to hepatitis B surface antigen were detected in human (11.3%), chimpanzees (29.9%), baboons (36.2%) and squirrel monkeys (5%). Chimpanzees showed an increasing prevalence of antibodies to hepatitis A virus and hepatitis B surface antigen with age.

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Human leukocyte typing sera of known specificities were used to test the leukocyte antigens of vervet monkeys. The results suggest that these leukocytes contained an antigen resembling the HL-A7 antigen of human leukocytes. This is similar to a previous observation with leukocytes from baboons. These findings are consistent with the suggestion that the 4a/4b complex is the precursor substance from which the other specificities have evolved.

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Ten species of nonhuman primates in West African habitat were analysed for variolavaccinia subgroup haemagglutination-inhibition (HI) and neutralization antibodies. The animals were taken in 27 different sampling zones in parts of the Ivory Coast, Mali, and Upper Volta. Of the 195 tested, 15 (8%) had elevated HI antibodies after nonspecific reactions were reduced with potassium periodate pretreatment. Positive neutralization antibodies were found in 21% (44 of 206). Antibodies were detected in serum from monkeys living near two areas where monkeypox cases in humans had occurred. Four samples were tested for monkeypox specific antibodies using an indirect immunofluorescent test; 3 were positive. Despite the prevalence of poxvirus antibodies in monkeys (and other animals) in West Africa, smallpox eradication has been maintained in the area since 1970; thus, animal reservoirs of poxvirus appear to pose no threat to the worldwide smallpox eradication programme.

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Rhesus and African green monkeys were treated with dexamethasome, antithymocyte globulin, 60Co irradiation, or combinations of those immunosuppressive agents, and the leukocyte response was followed. The lymphocyte population could be significantly depressed with 60Co, but dexamethasone was required to maintain a low lymphocyte count. The ability of the immunosuppressed animals to support the growth of transplanted tumor cells was markedly enhanced by the addition of ATG to the treatment schedule, even though ATG had no effect on the numbers of leukocytes in the peripheral circulation.

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