Aim To investigate the prevalence of Cryptosporidium sp. and B. hominis among human immunodeficiency virus (HIV) positive patients in two different outpatient clinics, Haji Adam Malik General Hospital and Primary Care Centre of Padang Bulan, Medan, Indonesia, between two interval periods. Method Cryptosporidium spp. microscopic examination, as well as Jones’ medium for B. hominis, were conducted in the Parasitology Laboratory, enzyme-linked immunosorbent assay (ELISA) was done in the Multidisciplinary Laboratory, Faculty of Medicine, Universitas Sumatera Utara. This was a cross-sectional study, involving 54 diarrheic HIV positive patients (44 males, 10 females). The data were analysed by Spearmen rank correlation, interrater agreement, and 2 tests. Results Infection rate for Cryptosporidium spp. and B. hominis was 24% (13 patients) and 9% (five patients), respectively. The prevalence of CD4 cell count below 200 cell/mm3 was relatively high, 29.6% (16 patients). There was a significant relationship between cryptosporidiosis and CD4 cell count (p=0.01; OR 1.57; 95% CI 1.25-1.99). Microscopic examination was superior over ELISA, whose diagnostic value for sensitivity and specificity was 46.15% and 100.0%, respectively, and Kappa (K) coefficient of 0.56. Conclusion The prevalence of cryptosporidiosis among HIV patients was still relatively high. CD4 count showed a significant relationship with Cryptosporidium spp. infection, but not with Blastocystic hominis. Microscopic examination is still the most reliable technique to diagnose the parasites in faecal samples.
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