CHEYENNE, WY. (AP) — A woman has contracted Wyoming’s first known human case of West Nile virus this year.

Wyoming Department of Health officials say the Campbell County woman contracted the more serious, neuro-invasive form of the disease.

They didn’t disclose her identity or condition but symptoms of neuro-invasive West Nile virus can include coma and paralysis. The World Health Organization says only about 1 in 150 people infected contract the more serious form of the virus.

The case occurred much earlier than usual. The mosquito-borne virus doesn’t usually begin appearing in people in Wyoming until late July or August.

Wyoming Department of Health officials documented four cases of West Nile virus, including one death, in Wyoming in 2018. They say the early case doesn’t necessarily mean more people will be infected this year.