STI: one in three men are carriers of the papillomavirus
© Shutterstock / Tatiana ShepelevaHuman papillomavirus (HPV) infection is a fairly common sexually transmitted infection. But if HPV in women ...
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Infectious diseases: farmed rats are carriers of still unknown viruses
© Getty ImagesAlthough it is sometimes considered a pet, the rat is best known for being a vector of disease. ...
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