Four cases under investigation in non-travelers may be first U.S. mosquito-borne infections.

Fatigue, burnout occur when there is an imbalance between work and recovery time.

Zika spreads male-to-female, female-to-male, needlesticks, and don't forget mosquitoes.

U.S. EDs, hospitals are vulnerable to a similar scenario.

U.S. Zika: 1,133 cases, 320 pregnant women with virus, 5 lost babies, 7 live births with defects.

Following suit as a deemed authority of CMS.

Going global: Deadly bug emerging on four continents.

The dilemma: Killing resilient bugs like C. diff without harming HCWs with powerful chemicals.