Postexposure prophylaxis v expectant treatment with oseltamivir at the time of developing influenza in household contacts (after treatment of all index influenza patients with oseltamivir)*

Outcomes at 10 daysHousehold populationPost exposure prophylaxisExpectant treatmentRRR (95% CI)NNT (CI)†
*LCI  =  laboratory confirmed influenza. Other abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
†NNT refers to number of households needed to treat.
Households with ⩾1 secondary patient with confirmed influenzaAll7.4%19.9%63% (27 to 81)9 (5 to 23)
Index patient had LCI10.7%25.8%59% (18 to 80)7 (4 to 28)