Other risk factors include working in healthcare, blood transfusions, dialysis, living with an infected person, travel in countries with high infection rates, and living in an institution. Tattooing and acupuncture led to a significant number of cases in the 1980s; however, this has become less common with improved sterilization. The hepatitis B viruses cannot be spread by holding hands, sharing eating utensils, kissing, hugging, coughing, sneezing, or breastfeeding. The infection can be diagnosed 30 to 60 days after exposure. The diagnosis is usually confirmed by testing the blood for parts of the virus and for antibodies against the virus. It is one of five main hepatitis viruses: A, B, C, D, and E. During an initial infection, care is based on a persons symptoms. In those who develop chronic disease, antiviral medication such as tenofovir or interferon may be useful; however, these drugs are expensive. Liver transplantation is sometimes recommended for cases of cirrhosis or hepatocellular carcinoma.Hepatitis B infection has been preventable by vaccination since 1982. As of 2022, the hepatitis B vaccine is between 98% and 100% effective in preventing infection. The vaccine is administered in several doses; after an initial dose, two or three more vaccine doses are required at a later time for full effect. The World Health Organization (WHO) recommends infants receive the vaccine within 24 hours after birth when possible. National programs have made the hepatitis B vaccine available for infants in 190 countries as of the end of 2021.
The film Cane Toads: An Unnatural History shows a male toad copulating with a female toad that had been run over by a car for eight hours. Necrophilic amplexus in frogs may occur because males will mount any pliable object the size of an adult female. If the mounted object is a live frog not appropriate for mating, it will vibrate its body or vocalise a call to be released. Dead frogs cannot do this, so they may be held for hours. The Amazonian frog Rhinella proboscidea sometimes practices what has been termed "functional necrophilia": a male grasps the corpse of a dead female and squeezes it until its oocytes are ejected before fertilising them. Treatment
Treatment for necrophilia is similar to that prescribed for most paraphilias. Besides advocating treatment of the associated psychopathology, there is little known on the treatment of necrophilia. There has not been a sufficient number of necrophiliacs to establish any effective treatments. However, based on the available data, clinicians are suggested to:

Determine whether or not a patient has necrophilia
Treat any psychopathology that is associated with necrophilia
Establish psycho-therapeutic rapport
Provide male patients with heightened sex drives with anti-androgens
Help patients find a normal sexual relationship
Help divert the necrophilic fantasies to a living object via desensitization

Case studies
Jeffrey Dahmer
Serial killer Jeffrey Dahmer (1960–1994) was known to perform oral sex or masturbate, or both, upon the corpses of his victims before dismembering them.