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The disease from becoming more severe. >> i'm hopeful that because of all the previous immunity, that while other people will be infected, most of the disease is going to be quite mild. >> reporter: although vaccine rates remain low in south africa-- just over 25%-- so many people have been previously infected with qorvgd it's providing high levels will of natural immunity. south africa's ramping up its inoculation drive. health regulators have approved, and the government is considering maxing vaccines : atbora patta, thank you. and we want to turn now to the trifle a former minnesota police ...

Shots came from this building here. >> i see police officers running back toward the school depository building. they are going to continue searching in that building for the would be assassin of the president. >> in the center of downtown dallas is in a virtual state of siege. they are combing the floors of the texas depository building in an evident to find the suspects assassin. >> in the building on the sixth floor, we found an area near a win that had partially been blocked off by boxes of books and also the three spent shells that will had apparently been fired from a rifle. >> crime lab...