Public health

In this Jan. 27, 2016 file photo, an Aedes aegypti mosquito known to carry the Zika virus, is photographed through a microscope at the Fiocruz institute in Recife, Pernambuco state, Brazil. The number of Zika virus cases has crossed 100 in Rajasthan, a state in northern India where palaces and forts draw large numbers of tourists each year. The agency says that the new cases come amid a state health department investigation to track the outbreak of Zika in pregnant women in their first trimester. (AP Photo/Felipe Dana, File)

In this photo taken Friday, Oct 5, 2018, family members and onlookers mourn over the bodies of civilian killed by The Allied Democratic Forces rebels in Beni, Eastern Congo. Congo’ military said Sunday Oct. 21, 2018, that rebels attacked an Ebola treatment centre in Beni, leaving over a dozen civilians dead and abducted about a dozen children, which could force crucial virus containment efforts to be suspended in the area. (AP Photo/Al-hadji Kudra Maliro)

FILE - In this Sunday, Sept 9, 2018 file photo, a health worker sprays disinfectant on his colleague after working at an Ebola treatment centre in Beni, Eastern Congo. The World Health Organization is announcing on Wednesday, Oct. 17 whether Congo's latest outbreak of the deadly Ebola virus should be declared a global health emergency. (AP Photo/Al-hadji Kudra Maliro, file)

In this Wednesday, Oct. 10, 2018, photo, manager Karen Stalk watches as a worker returns a greyhound after donating blood at Hemopet canine blood bank in Garden Grove, Calif. The organization said the dogs are walked at least five times daily and given outdoor recreation time. The animal rights group People for the Ethical Treatment of Animals (PETA) has filed a complaint alleging mistreatment of dogs at Hemopet, one of the nation's largest canine blood banks, a claim the nonprofit organization that runs the Southern California facility for retired racing greyhounds adamantly rejects. Hemopet said the dogs are well-cared for and provide a vital service that saves pets' lives. (AP Photo/Amy Taxin)

This 1981 electron microscope image made available by the Centers for Disease Control and Prevention shows varicella-zoster virions from a patient with chickenpox. On Thursday, Oct. 11, 2018, the CDC says a small but growing proportion of U.S. toddlers have not been vaccinated against any disease. (Dr. Erskine Palmer/CDC via AP)

Hong Kong Chief Executive Carrie Lam delivers her policy speech at the Legislative Council in Hong Kong Wednesday, Oct. 10, 2018. Lam has unveiled a major reclamation project called "Lantau Tomorrow Vision," under which about 1,700 hectares will be developed to provide homes for 1.1 million people, according to government radio. (AP Photo/Vincent Yu)