Why the coronavirus is killing doctors and nurses in the US

A medical examiner is calling for a federal probe into a fatal coronaviral illness that has killed at least four medical personnel in the United States.

The coronaviruses coronavillae are a type of virus that causes severe illness, usually with fever and other symptoms that can include coughing, breathing problems, and muscle aches.

The illness usually begins with coughing and is usually fatal.

Dr. Anthony Fauci, director of the Centers for Disease Control and Prevention, has urged the public to contact their state health departments to ask for help finding a health care worker who may have been exposed to the virus.

The Associated Press contributed to this report.