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 ...

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 ...

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 ...

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, ...