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>> reporter: theyre traveling to london in august. >> alzheimers threw us for a loop. this drug has thrown us a lifeline. >> reporter: kate snow, nbc news, new york. in the wake of last years tripledemic, health officials are trying to prevent a repeat this fall. chief medical correspondent dr. john torres is here. john, last year we saw flu, rsv and covid all at the same time. >> lester, last winter we had the three virus, influenza, covid, rsv. they all ended up peaking at the same time. alt...