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PubMed1985

Detection of coronavirus-like particles in homosexual men with acquired immunodeficiency and related lymphadenopathy syndrome.

Coronavirus-like particles were identified by electronmicroscopy in the feces of homosexual men. The particles banded at a density of 1.21 g/ml after cesium chloride density gradient centrifugation. To determine whether the presence of this virus might be related to clinical symptoms, several patient groups were studied prospectively. In 8 of 16 (50%) homosexual males with acquired immunodeficiency syndrome (AIDS) or unexplained lymphadenopathy syndrome (LAS), coronavirus particles were found. In contrast, such particles were found in none of 18 heterosexual controls and in only 3 of 20 homosexual males without AIDS or LAS. Thus, coronavirus excretion correlated significantly (2 alpha less than 0.01) with the clinical diagnosis of AIDS or with syndromes belonging to the AIDS-related complex. In addition, such particles identified in the serum of one patient with LAS and diarrhea suggest invasion and systemic spread of the agent and underline that this virus behaves differently from "common cold" human coronaviruses.

Acquired Immunodeficiency Syndrome↗
PubMed1988

Health in the early contact period: a contemporary example from Papua New Guinea.

In 1984 a rare opportunity arose to document the effects of contact on a previously isolated population in Papua New Guinea. The Hagahai, a small group of hunter-horticulturalists, remained hidden from government and mission influence until the early 1980s. Prior to that time, indirect contact through trade with neighboring peoples facilitated the entry of introduced infectious diseases. In late 1983 the Hagahai sought medical aid at a mission station, an event which accelerated their contact with the common epidemic diseases of the highlands. A wide variety of genetic, linguistic, ethnographic and medical data have been collected which document the historical sequence of events contributing to the current rapid demographic decline among the Hagahai. Serological evidence demonstrates the endemicity of Bancroftian filariasis, malaria, C. diphtheriae, cytomegalovirus, HTLV-1, the Ross River arbovirus and several viruses associated with the common cold. Recent epidemics include mumps, influenza A, and hepatitis B. They have not yet been affected by TB or measles, among others. Infanticide contributes to an estimated infant mortality rate of 568/1000. With a crude birth rate of 38 and a crude mortality rate of 51, the Hagahai appear to be dying out. The provision of adequate health care to these people is extremely problematic and beyond the capacity of the existing system.

Adolescent↗
PubMed1989

Effects and after-effects of the common cold and influenza on human performance.

Volunteers who develop a cold following virus challenge were significantly slower on choice reaction time tasks than those with no illness. This effect was still observed after the clinical symptoms had gone. In contrast to this, influenza illnesses only impaired performance in tasks in which subjects were uncertain where the target stimulus would appear. These results demonstrate that the CNS effects of respiratory virus infections depend on the type of virus, and that performance impairments may remain even after the symptoms of a cold have gone.

Adult↗
PubMedDate not supplied

Chronic social stress, social status, and susceptibility to upper respiratory infections in nonhuman primates.

OBJECTIVE: The objective of the study was to assess the roles of social stress and social status in susceptibility to upper respiratory infection. METHOD: Sixty male cynomolgus monkeys were randomly assigned to stable or unstable social conditions for 15 months. Two markers of social status, social rank and percent of behaviors that were submissive, were assessed at independent observation periods. Endocrine, immune, and behavioral responses were each assessed (at 3-month intervals) during the 9th through 14th months of the study. At the beginning of the 15th month, all animals were exposed to a virus (adenovirus) that causes a common-cold-like illness. The primary outcome was whether or not an animal developed an infection (shed virus) after viral exposure. RESULTS: Although the social instability manipulation was associated with increased agonistic behavior as indicated by minor injuries and elevated norepinephrine responses to social reorganizations, the manipulation did not influence the probability of being infected by the virus. However, low social status (as assessed by either marker) was associated with a substantially greater probability of being infected. It was also associated with less body weight, greater elevated cortisol responses to social reorganizations, and less aggressive behavior. However, none of these characteristics could account for the relation between social status and infection. CONCLUSIONS: Social stress was not associated with susceptibility to infection. However, animals with lower social status were at higher risk than high social status animals.

Adenoviruses, Simian↗