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From February 5 through April 23, 1982, 110 cases of mumps were reported among 357 students in a middle school in Ashtabula County, Ohio, an overall attack rate of 31%. Vaccine efficacy was calculated using a variety of case definitions, case surveillance systems, and vaccination-status ascertainment methods to evaluate their effects on the estimated vaccine efficacy. From data collected at the school for case ascertainment and vaccination status, clinical vaccine efficacy was initially estimated at 37%. By means of a uniform case definition (parotitis lasting two days or more) and only cases and vaccination status ascertained from parental questionnaires, estimated vaccine efficacy increased to 70%. From secondary attack rates in household members with provider-verified vaccination status, the vaccine efficacy further increased to 85%. This outbreak investigation confirms that the methods used to ascertain cases and determine vaccination status greatly affect estimates of vaccine efficacy. Studies relying solely on school records for case finding and determination of immunization status may provide misleadingly low estimates of vaccine efficacy for mumps vaccine as well as for other vaccines. Appropriate methods demonstrate that mumps vaccine is highly effective and support recommendations for its continued use.

Vaccinations are one of public health's greatest achievements. However, an ethical dilemma lies in the balance of personal autonomy and choice versus protection of the entire at risk population. Vaccines have become readily available in most parts of the world, yet debates continue as to the appropriateness of requirements for vaccinations, including legal mandates of vaccinations during public health emergencies and more routinely for school entry. This paper addresses ethical issues concerning vaccination requirements in the context of historical as well as current immunization program activities. Five important programmatic focus areas for immunization programs are identified for minimizing conflicts among the relevant ethical principles when developing and implementing vaccination requirements; namely: 1) reviewing and evaluating current vaccination mandates in the relevant health jurisdiction; 2) increasing the use of non-compulsory vaccination strategies; 3) addressing parent/guardian vaccine safety concerns; 4) enhancing public awareness of vaccine-preventable disease risks; and 5) promoting a better public understanding of herd immunity. We suggest that strengthening these programmatic focus areas can lead to a greater public acceptance of vaccination requirements.

Although current testing methods may shorten the window period to diagnosis of new HIV infection, they fail to prevent occupational acquisition of HIV in this setting. A California Occupational Safety and Health Administration-approved written health and safety program that emphasizes primary prevention is needed for this industry.

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