Analyses of more than 300 ancient human genomes show that Hepatitis B virus has infected humans for at least 4,500 years and has much older origins than modern viral genomes would suggest.

Researchers accidentally discover the first liver-tropic virus that infects non-primates.

A constitutional court upholds the requirement that Croatian children be vaccinated for hepatitis, measles, pertussis (whooping cough), diphtheria, and more.