A traveler passing through Newark Liberty International Airport tested positive for measles – one of the world’s most infectious diseases – earlier this month, officials said. The patient zero ...

People are being warned about a 'mystery virus' spreading in the UK which has symptoms that can feel worse than a cold or flu. A health expert says the illness isn't actually new but appears to be ...

Norovirus, the infamous "winter vomiting disease," is surging again across the United States. Norovirus is a highly contagious stomach bug that causes sudden, often violent bouts of diarrhea and ...

Viral infection is the invasion of the body by a small agent known as a virus. Viruses replicate inside host cells and can produce toxins that cause disease. The immune system helps to destroy viruses ...

Viral proteins are proteins generated by a virus. As viruses hijack much of their host's cellular machinery to support their life cycle, they encode very few of their own genes; viral proteins are ...