There were no fatalities among serologically confirmed cases. Cardiovirus B consists of four viruses that are most probably serologically distinct. The molecular basis of 22 of the 24 serologically defined antigens has been resolved. Puumala virus was the closest relative, both genetically and serologically. The virus was shown to be morphologically and serologically related to rabies virus. It is serologically similar to structures found on mammalian glycoproteins. It has a low sequence similarity to other hantaviruses and serologically distinct from other hantaviruses. The virus may be isolated or the infection diagnosed serologically by methods appropriate to vaccinia. For prevention, imported animals can be quarantined and serologically tested. PMV is serologically related to Molina streak virus and Maize mild mottle virus. The three subspecies causing yaws, bejel, and syphilis are morphologically and serologically indistinguishable. According to Fage (2013), the Tutsi are serologically related to Bantu and Nilotic populations.