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micrograph of skin infected with the smallpox variola virus

histologic changes in human skin that has been infected with the smallpox variola virus

smallpox virus pocks on the chorioallantoic membrane of a developing embryonic chick1

micrograph depicts the variola smallpox virus using a negative stain technique magnification 65000x

electron micrograph of a vaccinia virus close up

smallpox virus pocks on the chorioallantoic membrane of a developing embryonic chick

chick chorioallantoic membrane fluorescent antibody staining was done after smallpox virus inoculation

electron micrograph of a vaccinia virus virions cells

histochemical technique in processing this tissue specimen this image reveals the presence of the west nile virus

micrograph of the west nile virus it can infect humans birds mosquitoes horses and some other mammals

an electron micrograph of the west nile virus

west nile virus virions in an isolate that was grown in a cell culture

transmission electron micrograph of the west nile virus

micrograph of the west nile virus
