JOHN R. FREEDY, M.D., PH.D., and WILLIAM M. SIMPSON, JR., M.D.

The use of primary health care services increases for 12 or more months following a major disaster. It is important for physicians to understand individual and environmental risk factors that influence post-disaster health, as well as educate themselves regarding disaster-related health threats.

ALAINA B. JOSE-MILLER, M.D., JENNIFER W. BOYDEN, M.D., and KEITH A. FREY, M.D.

Major causes of infertility include male factors, ovarian dysfunction, tubal disease, endometriosis, and uterine or cervical factors. To successfully treat infertility, physicians must first determine the cause in the individual patient.

CHARLES COLE, M.D., and JOHN GAZEWOOD, M.D., M.S.P.H.

Although impetigo usually heals spontaneously without scarring, treatment can relieve the discomfort, improve cosmetic appearance, and help prevent the spread of this highly contagious condition.

Patient information: "Impetigo: What You Should Know," p. 868.

JAMES H. DIAZ, M.D., DR.P.H., M.P.H.T.M., and KIM EDWARD LEBLANC, M.D., PH.D.

Although most spider bites are harmless, some spiders produce toxic venom that can cause skin lesions, systemic illnesses, and neurotoxicity. Some of the more common venomous bites are inflicted by widow and recluse spiders. Early species identification and specific management can prevent most serious sequelae of these bites.

JANICE M. ANDERSON, M.D., and DUNCAN ETCHES, M.D., M.CL.SC.

Although risk factors have been identified, postpartum hemorrhage may occur in women with no risk factors, so physicians must be prepared to manage this condition at every delivery. A methodical examination is required to diagnose and manage the specific cause.