The north states and southern states show different trends both on this summer and now. The new surge of Covid-19 cases are main in northern states. However, the outbreaks in southern states were more are more serious in this summer.
The general public received confusing information on face masks for preventing viral infections. Some health experts, politicians told people masks are not needed. While Asian governments recommended people to wear faces masks because of the painful memory of 2003 SARS epidemic.
Common buffers for drug release experiments.
Novel coronavirus (2019-nCoV) originated in Wuhan, an inside city in China and quickly spread throughout almost all the provinces and other countries. The second case of coronavirus was confirmed in Chicago on Jan 23 in the United States. How can we confirm the diagnosis?