Coronavirus new infections in US dropped to 23570 in April 13, SHOWING a turning point in US COVID-19 infection. It is a mixed effect of staying home in US and hot weather in several states(Florida, Georgia, South Carolina, California). World new cases were also dropped to 72778, showing a sign of turning point of COVID-19. Data of South America, Africa, other tropic nations indicate that when it is closer to summer, new infection number would drop even more. Summer is May 5, only 22 days left, please stay home to help control the pandemic and help yourself and your family.