(CNN) — Six dairy herds in Nevada have tested positive for a newer variant of the H5N1 bird flu virus that’s been associated with severe infections in humans, according to the Nevada ...

It’s not the only illness spreading, either: Wastewater testing also shows high levels of the virus that causes Covid-19 across the country — well above levels seen at the start of winter.

Here’s a look at Zika virus, an illness spread through mosquito bites that can cause birth defects and other neurological defects. Facts Sources: Centers for Disease Control and Prevention (CDC), ...