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… of the body's natural defence system that helps fight infections ( immune system ). The immune system normally … often occur along with other problems, such as asthma , ear infections , sinusitis , and sleep apnea . Types of … of the body's natural defence system that helps fight infections ( immune system ). The immune system normally …
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… caused by a virus, such as a cold or influenza (flu). Infections caused by bacteria, such as a urinary infection … unusual for a preschool-aged child to have 7 to 10 viral infections in a year. Each new viral infection may cause a … from a new illness. Common causes of a fever include: Viral infections , such as colds, flu , and chickenpox . Bacterial …