U.S. childhood vaccine availability: legal, regulatory, and economic complexities.

Despite the vital role they play in public health, childhood vaccines travel a complicated road from laboratory to provider and patient. From the fall of 2000 until well into 2002, a combination of factors, including market dynamics, legal challenges, and regulatory hurdles, led to a shortage of some childhood vaccines. This paper examines each of these factors, focusing on the important roles of both the public and the private sectors.