Re: so you think you could be an MD?
1. Sounds like he has measles. So isolate him, vaccinate anyone he's been in contact with that's never had it, and manage his symptoms.
2. Rheumatic fever? The joint swelling made me think that right away but I'd need way more info to make that determination. Either you left out a bunch of symptoms or I am completely off base here. I would ask if the child had a sore throat within the past month or so at least...
3. This is not nearly enough information. You basically just try and get him hydrated and treat his symptoms to maybe get some nutrients in his body. Take a history to try and find out what caused this (like have you been out of the country, etc). That will give you a better idea where to start looking (parasite, virus, etc). The blood in the stool means it's reasonably serious, but that's about all you can get from that info. Need to run some blood tests and take a stool sample to know where the blood is coming from and how much he is losing.
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