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positive for covid again. what we know about his symptoms and we're going to talk to an expert about how rebound cases work. plus, anger, outrage, and sheer frustration after senate republicans block a bill to help veterans impacted by burn pits. we'll talk to a woman who lost her husband to a burn pit exposure. you'll hear her message to lawmakers. and explosions rocked southern ukraine. some calling it the strongest shelling since the start of the war. our cnn team is live in kyiv with the very latest. we'll take you to ukraine. it is sunday, july 31st, thank you so much for ...

All positive signs. but, of course, you know, he's got fantastic doctors and medical team and if he starts having that -- those rebound symptoms, that would be cause to put him on paxlovid and watch him even closer. >> doctor, i want to get your thoughts on another viral outbreak that is in the headlines, monkeypox recently new york city declared a public health emergency, officials sounding the alarm, and warning that the window to get the virus under control is closing. what should officials be doing and what should the general public be doing right now to limit the spread? >> the numbers ar...

Previous lineages that may have something to do with it. but it seems to be happening pretty frkequently. if you get treated with paxlovid, you're improved, you're asymptomatic, you test negative, and four or five days later, what happens is you either have a recurrence of symptoms and test yourself and find yourself to be positive, that's what happened to me, that's what happened to dr. fauci, it is what happens to a number of other individuals now. so we're investigating the mechanisms of it, first, we were concerned maybe drug resistance had developed, but it doesn't look that way. the viru...

Positive for covid again. what we know about his symptoms and we're going to talk to an expert about how rebound cases work. plus, anger, outrage, and sheer frustration after senate republicans block a bill to help veterans impacted by burn pits. we'll talk to a woman who lost her husband to a burn pit exposure. you'll hear her message to lawmakers. and explosions rocked southern ukraine. some calling it the strongest shelling since the start of the war. our cnn team is live in kyiv with the very latest. we'll take you to ukraine. it is sunday, july 31st, thank you so much for waking up ...

Cnn's ryan young has more. >> reporter: more shootings and more 911 calls have police departments around the country struggling to meet the growing need with departments stretched thin. heading into a busy summer, where calls for 911 emergency s service spiked. >> is she threatening anyone right now? >> reporter: not only dealing with shortages out in the field, but in this room. >> the people working here are working long hours, extra overtime to cover other shifts. but we have to have someone answering the call. it is a critical. >> reporter: the worker shortage is disrupting public safety a...