AdvertisementWHO Chief Warns 'There Might Never Be' A Silver Bullet For CoronavirusAugust 03, 2020Laurel WamsleyfacebookEmailWorld Health Organization Director-General Tedros Adhanom Ghebreyesus says that while some COVID-19 vaccine candidates have progressed to phase three testing, the world must remain reliant on "the basics" of disease control. Tedros is seen here last month in Geneva. (Pool/AFP via Getty Images)