taterapox virus
The phylogenetically closest virus to variola, the cause of smallpox, is the taterapox virus (TATV). Despite the resemblance, the virus has not been thoroughly studied. TATV can infect a variety of animals in vivo, but it has no noticeable effect on mice of the wild type. However, in some immunocompromised strains, TATV can cause morbidity and mortality.
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