Asthma with high-grade fever. already had a flu shot hence flu is ruled out. what is the possible cause? patient went on a field trip the day before symptoms arose.

Virus trigger asthma: Probability is a viral infection, a much more common precipitator of acute asthma than bacterial infections. The flu shot only immunizes against certain "flu" strains. I suspect if you check with other parents of children in his class he's not the only one sick. Be sure he's taking his asthma medications and fluids. If not adequately controlling his breathing check with his physician/urgent care.

See below: Another viral or bacterial infection. Did the patient have an insect, or tick bite? That may cause allergic reaction, which sometimes can induce high fever, or infection, including more obscure things such as lyme disease etc. See a specialist. Also, flu shot does not give 100% protection, but this does not sound like it.

Fever,asthma.field t: Flu shot does nto protect 100% as other strains of influenza can cause flu. Aslo, other kids could have other viral infectiosn that ur child got exposed to. How high is the fever? If persists see ur pediatirician.