Hi, welcome to the forum, in simple terms, an allergy is a hyperactive response of the immune system to certain substances which are "foreign" to our bodies. These substances are called "allergens", and they can range from food and pollen to dust and drugs.
Viral infections are the most common cause of illness in children. Your child would be allergic to the some drugs, but it's most unlikely a virus. Or if he is having hives, rash, fever etc symptoms your child may be infected by virus.
The most common viruses in children are the influenza virus, respiratory syncytial virus (RSV), rhinovirus and adenovirus, hepatitis viruses, cytomegalovirus etc
You need to maintain proper hygiene of him/her. Also you can give him healthy food like milk, fruits, vegetables, regular exercise to increase immunity. Allergy problems are less seen in children’s who are breast fed. Advances in medicine have lead to the development of several vaccines that protect against viruses which once caused disease. I suggest you to consult pediatrician and immunologist. Take care and regards.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.