Single-dose treatment of bacteriuria in pregnancy.

Comparison of the results of single-dose treatment of urinary tract infection in women is confused by differences between published series in the duration of follow-up and in the diagnosis of infection. Pregnancy allows prolonged follow-up in a motivated population, but increases the possibility of false positive diagnosis of infection from midstream urines due to increased vulvovaginal contamination. Suprapubic aspiration (SPA) is safe in pregnancy and accurately confirms the presence or absence of bacteria in the bladder urine. Bacteriuria was diagnosed by SPA in 86 pregnant women. Thirty-seven of these were treated with a single dose of 3 g cephalexin and 49 with 3 days of cephalexin 1 g or of a combined preparation of pivmecillinam-pivampicillin. Both single-dose and 3-day treatments prevented further bacteriuria in 65% of the patients for the remainder of their pregnancies. This is similar to the results achieved with 10-day treatment. If extended trials confirm that single-dose treatment is as effective as conventional treatment with the same drug, then single-dose treatment has the advantages in pregnancy of minimal medication, good patient compliance and lack of side-effects.