Influenza virus Researchers have tried for many years to identify the subtypes of
Influenza A responsible for the 1889–1890, 1898–1900 and 1918 epidemics. This view is corroborated by converging seroarcheological and mortality data. In blood sera collected in 1956–1957, birth cohorts likely exposed early in life to the 1889–1890 pandemic had the highest percentages of detectable antibodies against the H3 strain that was later responsible for the 1968 pandemic. Correspondingly, excess mortality decreased sharply during that pandemic for these cohorts, who were 78 years old or older at the time.
Coronavirus After the
2002–2004 SARS outbreak, virologists started sequencing human and animal
coronaviruses. A comparison of two virus strains in the
Betacoronavirus 1 species
bovine coronavirus and
human coronavirus OC43 indicated that the two had a
most recent common ancestor in the late 19th century, with several methods yielding most probable dates around 1890. The authors speculated that an
introduction of the former strain to the human population, rather than influenza, might have caused the 1889 epidemic. While a small sample of dental remains has been tested and lends weight to the hypothesis, there is still no scientific consensus that the 1889–1890 outbreak was caused by a coronavirus, with one analysis of the literature suggesting that the evidence for this causality is still "conjectural". Before the first outbreak of Russian influenza, Tomsk province was experiencing an epizootic of pneumonia in cattle. Every year from June to November, up to 13,000 cattle, mostly from the Kulunda steppes, Barnaul district and Semipalatinsk region, were brought to Tomsk for slaughter. In autumn 1889, pneumonia was recorded among cattle in Tomsk. But despite the outbreak, the cattle were not isolated and moved freely through the streets of the city. Meat prices dropped to 1 ruble per
pood. Because of the resulting disease, the inhabitants of the city either slaughtered the cattle or sold the animals very cheaply (a cow cost from 5 to 8 rubles). The inhabitants of Siberia hoped that with a drop in temperature the epizootic would subside. The newspapers wrote: "Siberians obediently waited for the onset of cold weather, with the appearance of which, however, the epizootic even more intensified, yes, in addition to it came and obnoxious Influenza. Notes on the relationship between influenza and animal diseases were found in the newspaper "Physician" 1889 г.: "...the connection of influenza with epizootics on horses, dogs and cats is undoubted; these epizootics have much in common with influenza...".These data are in favour of the theory that the "Russian influenza" of 1889 could have been caused by a coronavirus transmitted from cattle to humans. == Patterns of mortality ==