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  • Title: [Tenth anniversary of smallpox eradication: Results of epidemiological and virological surveillance and studies in the post-eradication period].
    Author: Marennikova SS.
    Journal: Zh Mikrobiol Epidemiol Immunobiol; 1989 Jun; (6):23-9. PubMed ID: 2552712.
    Abstract:
    In accordance with recommendations of the Global Commission on the certification of smallpox eradication for the 10-year period after the eradication of this infection, all suspected cases of smallpox have been thoroughly checked up, and in none of them the diagnosis of smallpox has been confirmed. The study of monkeypox in humans has revealed that this zoonosis is spread over a wider area than supposed earlier and covers 7 countries of Equatorial Africa, occurring most frequently in Zaire. In about 70% of cases of monkeypox in human the disease is contracted from animals serving as natural virus carriers and in about one-third of such cases, from humans having monkeypox. The infectivity of humans with monkeypox for persons having close contacts with them is somewhat lower (12.3%) than in smallpox when this characteristic varies from 37% to 88%. Monkeypox in humans may take an asymptomatic course. Some species of tropical squirrels serve as natural virus carriers. These investigations have also resulted in essential corrections being made in understanding the ecology of cowpox virus, another orthopoxvirus pathogenic for man. At least 5 species of rodents have proved to be of interest as natural carriers of cowpox virus.
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