Many children get chickenpox.
Serious problems caused by chickenpox can send adults and children to the hospital.
Dehydration Ear infections The most common problem that chickenpox can cause in adults is pneumonia. Chickenpox occurs most commonly among children between 1 and 6 years of age. Because chickenpox virus may not survive and transmit well in warm climates, adults from tropical regions are more likely than others never to have had chickenpox. They are therefore at higher risk of exposure to the disease when they come to the United States.