Symptoms usually start 2 to 3 weeks after virus exposure. Early symptoms may include:
- A fever and chills
- Muscle aches and headache
- Nausea, vomiting, diarrhea, and belly pain
After a few days, more serious symptoms such as:
- Shortness of breath
- A fast heartbeat and fast breathing
After a person with HPS starts having trouble breathing, he or she may die within hours. Most deaths occur within 1 to 2 days after severe breathing problems. About 4 out of 10 people who get HPS do not survive.