Epidemic shigellosis on a worktrain in Labrador.

An epidemic of shigellosis occurred on a worktrain in western Labrador in October 1974. During the outbreak 62 persons out of a crew of 91 became ill, 11 having recurrent illness; 14 were hospitalized. Epidemiologic analysis with laboratory confirmation implicated unchlorinated and contaminated lake water as the source of the epidemic. Faulty design of water storage tanks perpetuated the use of contaminated water; hence a second wave of illness occurred. The tanks were then thoroughly drained, cleaned and repaired. Many deficiencies in sanitation measures (most of which have since been rectified) were noted at the site of the epidemic as well as at other locations along the railway. Careful sanitation controls are essential in rapidly developing areas of northern Canada.