Vernal keratoconjunctivitis and intestinal parasitic infestations in black children.

The study aimed at finding out any association between vernal keratoconjunctivitis (VKC) and intestinal worm infestations in black children in Nigeria. This is a report of a case-control study of a total of 117 cases of VKC and 198 controls, who were newly presenting to two hospitals in Ibadan. The controls were comparable to the cases in many respects. While 67 (57%) of cases admitted to previous passage of worms, 59 (50.5%) children actually had parasitic infestations. Of these 59 children, 30 (51%) were due to roundworm, 12 (20%) to hookworm, 14 (24%) to protozoal infestation and others, e.g., tapeworms, 13 (5%). Among controls, 36.8% had parasitic infestation, out of which roundworms were responsible for 11.6%, hookworms 7.6%, protozoa 14.1% and others 3.5%. Children with VKC have almost twice (odds ratio = 1.68) the risk of having been infested by worms. Both older age in children and roundworm infestation were not independent risk factors for VKC. There was no significant association among all ages, sex, hookworm and other worms with VKC. Deworming may prove beneficial for children with VKC; however, more studies with appropriate design are required to prove this.