CDC issues advisory on increased parvovirus B19 cases in the U.S. 

The Centers for Disease Control and Prevention Aug. 13 issued an advisory alerting of an uptick of cases of parvovirus B19 across the U.S. Parvovirus B19 is a seasonal respiratory virus spread by respiratory droplets through symptomatic or asymptomatic individuals. Many people are asymptomatic, but immunocompetent children and adults with symptomatic disease typically develop a biphasic illness, CDC said. The first phase lasts approximately five days and includes symptoms of fever, myalgia and malaise, which develop about a week after infection. During the second phase, children often develop a facial rash which may be followed by reticulated body rash or joint pain one to four days later. For immunocompetent adults, the most common symptoms of parvovirus B19 disease typically occur during the second phase and include a reticular rash on the trunk and joint pain. Parvovirus B19 infection could also lead to adverse health outcomes among people without pre-existing immunity who are pregnant, immunocompromised or have chronic hemolytic disorders.