this investigation was performed on 1056 stool samples collected from isfahan area (with high intensity of infection) and dasht-mishan area of khuzestan. as indicated in tables 1, 2 and 3 the results of kato thick-smear technique is comparable to those conventional methods of formalin-ether and flotation methods, plus low cost, simplicity and practicability of kato's thick-smear. for ascaris eg...

SIR The article by Chaturvedi and McKeigue' fails to mention the danger of relying on the 1991 UK census as an accurate estimate of ethnic minority populations. Both Ballard and Kalra,2 in their discussion of the census nationally, and Glover,3 in his figures for the London areas of Camberwell and Hammersmith, point out the huge underrepresentation of black Caribbean men aged 25 to 44. Both rep...

Many National Tuberculosis Programmes (NTPs) receive Technical Assistance (TA) for the implementation and evaluation of their TB-control strategies. KNCV tuberculosis Foundation (KNCV) in the Netherlands is a TA organization providing assistance for many years in over 30 countries. The NTPs use their own surveillance data to assess TB control strategies. These data are not accurate enough to se...