Viruses are smaller than bacteria. For example, at 45 nanometers (1 nanometer = 0.000001 millimeter), the hepatitis virus is approximately 40 times smaller than E.coli. By comparison, a human red ...

Seven kinds of virus collectively comprise an important cause of cancer, particularly in less developed countries and for people with damaged immune systems. Discovered over the past 54 years, most of ...

I’ve had it up to here with viruses lately. It’s easy in these times to wonder whether there’s anything good about them. That made me curious about why viruses exist in the first place, and where they ...

Besides serving as food for certain microbes, viruses perform some helpful functions that remain poorly understood. A ciliate, a type of single-celled microbe, swims next to Sphagnum moss, amplified ...

The timing and origin of Zika virus (ZIKV) introduction in Brazil has been the subject of controversy. Initially, it was assumed that the virus was introduced during the FIFA World Cup in June–July ...

Scientists have more evidence, but we may never know exactly what happened. The World Health Organization and China released a long-awaited joint report into the origins of COVID-19 on Tuesday, ...

Penn Vet’s Louise Moncla has tracked H5N1 viruses to better understand the role wild birds play in the current HPAI outbreak ...

In a recent study published in the journal Nature Communications, researchers examined the phenotypic and genetic evolution of clade 2.3.4.4b highly pathogenic avian influenza A(H5N1) viruses ...