| camelpox | (noun) a viral disease of camels closely related to smallpox | - |
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| chickenpox | (noun) an acute contagious disease caused by herpes varicella zoster virus; causes a rash of vesicles on the face and body | Synonyms: varicella |
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| cowpox | (noun) a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox | Synonyms: vaccinia |
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| pox | (noun) a contagious disease characterized by purulent skin eruptions that may leave pock marks | - |
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| (noun) a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta) | Synonyms: lues, lues venerea, syph, syphilis |
| pseudosmallpox | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: alastrim, Cuban itch, Kaffir pox, milk pox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| rickettsialpox | (noun) mild infectious rickettsial disease caused by a bacterium of the genus Rickettsia transmitted to humans by the bite a mite that lives on rodents; characterized by chills and fever and headache and skin lesions that resemble chickenpox | - |
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| smallpox | (noun) a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars | Synonyms: variola, variola major |
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