General

Seasonal allergies, also called hay fever or allergic rhinitis, can cause sneezing, congestion, runny nose, coughing, and itchy or watery eyes. Symptoms often occur when pollen from trees, grasses, or weeds is in the air.

Many people can manage mild symptoms with exposure reduction and appropriate over-the-counter treatment. Persistent, severe, or unclear symptoms deserve professional evaluation.

Typhoid fever and paratyphoid fever are serious illnesses caused by related Salmonella bacteria. In the United States, many cases are associated with international travel.

These infections do not spread simply because one family member is nearby. Transmission usually occurs when food or water is contaminated.