“…In fact, the incidence among the newborn may be higher than in other age groups; congenital defects in the kidney may predispose (Porter and Giles, 1956). Postmortem studies suggest that the prevalence of urinary infection is still underestimated (Kleeman, Hewitt and Gaze, 1960); about 2%/, of routine autopsies on American children disclose evidence of pyelonephritis (Pryles and Neumann, 1962;Spark, Travis, Dodge, Dalschmer and Hopps, 1962;Macaulay, 1964), but the difficulties in diagnosis of this infection from postmortem material must be borne in mind. An increased incidence of pyelonephritis in siblings has been noted (Kunin, Deutscher and Paquin, 1964).…”