Chinanews.com reported on February 29. In the evening of the 28th local time, the Washington State Department of Health announced that there were two new cases of positive coronary pneumonia in the state, including a woman from Jinxian who had recently visited South Korea, and Sri Lanka. A high school student in Norhomish County.
The two cases were listed as "presumed positive" patients, which means that the patients tested positive for the virus in the state's laboratory, but the test results still need to be confirmed by the Federal Centers for Disease Control and Prevention (CDC).
Authorities said that a student at Jackson High School in Snowhomish County had recently been quarantined at home. The patient had no recent travel history and the source of the infection was unknown, making it the fourth positive case of new crown pneumonia in the United States with unknown source of infection. The CDC has listed it as a "possible case for community transmission," and the source of the infection is still under investigation.
The Washington State Department of Health said that the high school he attended will close until March 3 and undergo deep disinfection.
Earlier, U.S. health officials reported that a third positive case of New Crown Pneumonia Virus of unknown origin was found in Oregon and that the patient had been admitted to the hospital. The first two cases of new coronary pneumonia of unknown origin in the United States came from California.