Two invasive species of mosquitoes that can carry Zika, dengue, yellow fever and other dangerous viruses are spreading in California — and have been found as far north as Sacramento and Placer counties.

There are now 16 counties where Aedes aegypti, commonly known as the yellow fever mosquito, has been detected, according to the state Department of Public Health. Five of those counties have also detected Aedes albopictus, the Asian tiger mosquito.

HILLSBORO, Ore. — On Kimberly Repp’s office wall is a sign in Latin: Hic locus est ubi mors gaudet succurrere vitae. This is a place where the dead delight in helping the living.

For medical examiners, it’s a mission. Their job is to investigate deaths and learn from them, for the benefit of us all. Repp, however, isn’t a medical examiner; she’s a Ph.D. microbiologist. And as the Washington County epidemiologist, she was most accustomed to studying infectious diseases like flu or norovirus outbreaks among the living.

More than half of adults and one third of children in Europe are classified as overweight or obese, with the highest proportion coming from lower socio-economic groups where Non-Alcoholic Fatty Liver Disease (NAFLD) is prevalent.

NAFLD is the accumulation of excess fat in the liver and has become the most common cause of liver disease in Europe due to the rapid rise in levels of obesity. It is a major European health burden resulting in liver cirrhosis and liver cancer, as well as big increases in cardiovascular disease and non-liver cancers.

Lack of physical activity and excess calorie intake leads to weight gain and fat deposition, which plays a major role in the development and progression of NAFLD.

Though a modern naturalism movement has tried to shame mothers who don't, won't, or can't breastfeed, using bottles of animal milk - the prehistoric version of formula - turns out to be an ancient tradition.

Infant feeding vessels made of clay first appear in Europe in the Neolithic and became more commonplace throughout the Bronze and Iron Ages. The vessels are small enough to fit in a baby's hands, have a spout, and sometimes even feet and are shaped like imaginary animals. 

A new study worries that teabags containing plastic come with a dose of micro- and nano-sized plastics.

Opposing views on e-cigarettes, witnesses interrupting members of Congress and even a wink. A hearing Tuesday on the epidemic of respiratory injuries linked to vaping was one unusual show.

Since the spring, hundreds of reports have surfaced about severe lung injuries associated with vaping and using e-cigarettes. The Centers for Disease Control and Prevention has identified at least 530 cases, including at least seven deaths, and states have reported two others.

In recent weeks, as the news crept wider into the headlines, it galvanized state and federal public health officials to warn people against vaping until the crisis is better understood.