FILE - In this May 10, 2012, file photo, a doctor holds Truvada pills at her office in San Francisco. New research shows more promise for using AIDS treatment drugs, such as Truvada, as a prevention tool, to help keep uninfected people from catching HIV during sex with a partner who has the virus. Truvada has been shown to help prevent infection when one partner has the virus and one does not, but the evidence so far has been strongest for male-female couples. (AP Photo/Jeff Chiu, File)

FILE - In this Feb. 12, 2018, file photo, LGBT activists shout slogans during a rally against a planned revision to Indonesia's criminal code that would criminalize unmarried and gay sex outside the Parliament in Jakarta, Indonesia. The death of a 20-year-old man with HIV who died after "effectively committed suicide" by stopping anti-viral medication is a sign of an out of control but little acknowledged epidemic of HIV among gay men in Indonesia that researchers say is now being fueled by a gay hate climate fostered by the country's conservative political and religious leaders. (AP Photo/Tatan Syuflana, File)

Dr. Robert Redfield Jr., director of the Centers for Disease Control and Prevention, is photographed at the agency's headquarters in Atlanta, Thursday, June 28, 2018. The head of the nation’s top public health agency once opposed condoms and needle exchange programs as ways to stop the spread of sexually transmitted diseases. But in one of his first media interviews since taking office, Redfield said his views have changed. (AP Photo/David Goldman)

FILE - In this Wednesday, Feb. 7, 2018 file photo, a nurse prepares a flu shot in Atlanta. On Friday, June 8, 2018, health officials said the flu killed more children in the past year that during any other regular flu season in recent history. (AP Photo/David Goldman)

In this May 22, 2018, photo, schoolchildren wash their hands to help contain the Ebola outbreak before entering a classroom in the north-western city of Mbandaka, in Congo. Congo's health ministry announced six new confirmed Ebola cases and two new suspected cases Tuesday as vaccinations entered a second day in an effort to contain the deadly virus in the city of more than 1 million. (Mark Naftalin/UNICEF via AP)

In this photo taken Sunday, May 20, 2018, a team from Medecins Sans Frontieres (Doctors Without Borders) dons protective clothing and equipment as they prepare to treat Ebola patients in an isolation ward of Mbandaka hospital in Congo. Congo's health ministry announced Tuesday, May 22, 2018 six new confirmed cases of the Ebola virus and two new suspected cases while a vaccination effort enters its second day. (Louise Annaud/Medecins Sans Frontieres via AP)

Dr. Guyauma Ngoyi Mwamba, centre, representative of the Democratic Republic of Congo on Expanded Program on Immunization, is administered with a vaccine during a vaccination campaign in Mbandaka, Congo Monday, May 21, 2018. Congo's health minister says a nurse has died from Ebola in Bikoro, the rural northwestern town where the outbreak began, as the country begins a vaccination campaign. (AP Photo/John Bompengo)

In this photo taken Monday, May 14, 2018, members of a Red Cross team don protective clothing before heading out to look for suspected victims of Ebola, in Mbandaka, Congo. Congo's Ebola outbreak has spread to Mbandaka, a crossroads city of more than 1 million people, in a troubling turn that marks one of the few times the vast, impoverished country has encountered the lethal virus in an urban area. (Karsten Voigt/International Federation of Red Cross and Red Crescent Societies via AP)