I'd be careful about posting medical advice like you are without fact checking.Kernig's is actually a pretty bad test for meningitis. It has a sensitivity of only 5% and a PPV of 27%. That's pretty awful. I also wouldn't recommend for untrained people to test it on themselves or their loved ones.Not all types of meningitis causes a rash. I believe you're referring to meningococcemia. I think this diagnosis is extremely unlikely as she has been having symptoms for 19 days. She would be dead by now. Symptoms of meningococcemia progress very rapidly. Also, the tumbler test is also a pretty bad test and all it does it to be able to differentiate petechiae from other blanchable rashes. It's not specific to meningococcemia and can also just be done with a finger."Prolonged fever" do not cause rash. I am not sure what you are referring to here. Yes, a lot of diseases that can cause fever are also associated with rashes but it's not the fever itself that leads to a rash.I don't think Mono is likely here. While some of the symptoms would match, it would be unlikely to have persistent fevers for 19 days with simple mono.OP, I believe that at this point a visit to the hospital is warranted if your wife is as impaired as you are describing it.
How severe is the neck pain? Look up Kernigs sign. Its a maneuver you can do to test for meningitis. Meningitis is the inflammation of the lining of the spinal cord and meninges in the brain. It can be caused by both virus or bacteria. Shed be positive if she has extreme pain and cant extend past 90. If thats positive, you need to call the doctor/ED. Also, meningitis can cause a pinpoint rash. If shes darker skinned, you could see it more easily on the palms and soles of the feet. Rashes May also appear with prolonged fever. You can do the tumbler test where you take a clear glass and press it against the rash. If redness goes away when pressed, then its negative. If you can see the rash still through the glass, then its positive. Its sounding more like Mono. If possible, see if the doctor can test. Mono needs to run its course, but it can have some complications. One of them in enlarged spleen, so no sports and if she has sudden upper left abdominal pain go straight to the ER. It also can cause liver issues, so watch out for jaundice which is yellowing if the skin. I hope she starts feeling better soon OP!