Hepatitis D is caused by a defective RNA virus (delta agent) that can replicate only in the presence of hepatitis B virus. Hepatitis B infection rarely occurs as coinfection during acute hepatitis B or as superinfection during chronic hepatitis, also type B.

Nickel allergy: intolerant people in Italy are 32%.
Nickel is a heavy metal found in many everyday objects. Indeed, it can be found in jewelry (especially earrings and watches) in zippers, jeans buttons, but also in bracelets, keys,