CLOSE It takes a lot of people to develop a COVID-19 vaccine. Volunteers may be one of the most important. WochitAmid promises this week from the president and pharmaceutical companies that there may be a COVID-19 vaccine within months, the head of the World Health Organization said Friday that the agency won’t recommend any vaccine before it is proven safe and effective.A WHO spokesperson told Reuters Friday that the agency does not expect widespread vaccinations against COVID-19 until the middle of next year.And this Labor Day weekend, health experts worry that gatherings — of all sizes — could push another coronavirus surge. With temperatures forecast to reach triple digits in California, the beaches are expected to be crowded. Families and friends will gather for cookouts across the country. And, in South Dakota, the annual state fair will bring together thousands for cotton candy and amusement rides.On Friday, President Donald Trump addressed the holiday weekend, urging “everybody to be careful.” He encouraged “social distancing, wearing a mask whenever the distancing is not possible.” The comments come hours after Trump mocked Democratic opponent Joe Biden for wearing a mask.Some significant developments:Democratic presidential candidate Joe Biden confirmed Friday that he has been tested for COVID-19 and said that he

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