PEDIATRICS Vol. 82 No. 5 November 1988, pp. 810
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Varicella Exposure Time

PHILIP A. BRUNELL MD1

1 Department of Pediatrics, Cedars-Sinai Medical Center, 8700 Beverly Blvd, Los Angeles, CA

To the Editor.—

The statement by Johnson et al1 that varicella was "protective against 96% of exposures" is misleading. Protection implies that disease was prevented. A continuing household exposure, eg, to a sibling, would be expected to produce an attack rate approaching 100%.2 Only four vaccinees had this type of exposure; 49 had other less intense types of exposure. The outcomes of other types of exposure are far less predictable but normally are not nearly as likely to result in varicella.3