In the "Booster-Trigger Hypothesis," Knip et al.
The streptococci represent a large group of bacteria which were first identified by Christian Albert Theodor Billroth in and classified into an alphabetical sequence by the American bacteriologist Rebecca Craighill Lancefield in
Yet other studies have not found evidence of viral infections before type 1 development.
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Shulman ST, et al.
In the twentieth century a resurgence of syphilis occurred amongst troops of all nations during the First World War and to some extent during the Second World War.
This allows for the possibility of frequent infections in pigs with both human and bird strains of the virus.
The nineteenth century witnessed a series of pandemics, which produced some profound social reactions.