Welcome back to icliniq.com.
I understand your concern.
One organism that causes primary meningoencephalitis and disseminates, as you might expect, is Naegleria fowleri. However, the symptoms are not the same as the flu. They include fever, vomiting, altered mental status, and focal neurological deficit. If you have already visited the ER (emergency room) and the child is healthy between the fever episodes, you do not need to be concerned. However, the patient is typically very ill, and I am confident that no doctor will ignore these symptoms. Please update if you can list all the symptoms your child experiences and how he acts after taking tablet Tylenol (Paracetamol). Does he eat? Does his mental state change? Are there any other symptoms that don't seem to fit the flu?