Browsing by Author "Tzipori, Saul"

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    Clinical Significance of Respiratory Involvement in Cryptosporidiosis: Cross-Sectional Study of Children with Diarrhea and Respiratory Symptoms in Uganda
    (2024-10) Mor, Siobhan M; Ndeezi, Grace; Ascolillo, Luke R; Tasimwa, Hannington B; Attipa, Charalampos; Sponseller, Jerlyn; Mukunya, David; Nakato, Ritah; Kayondo, Lilian N; Tzipori, Saul; Tumwine, James K; Griffiths, Jeffrey K
    Respiratory cryptosporidiosis is considered an occasional, late-stage complication of HIV/AIDS. This study aimed to assess the clinical importance of respiratory cryptosporidiosis in children with diarrhea and respiratory symptoms at Mulago Hospital, Kampala, Uganda. Children aged 9 to 36 months presenting with diarrhea and cough or unexplained tachypnea (N = 1,918) were screened for fecal Cryptosporidium using polymerase chain reaction (PCR). Children with positive stool samples were eligible for further diagnostic tests, including sputum induction. Sputum samples were subjected to PCR for Cryptosporidium, as well as routine microbiology (culture and gram stain) and auramine stain for tuberculosis. Regression analyses were used to investigate 1) factors associated with respiratory cryptosporidiosis and 2) whether respiratory cryptosporidiosis was independently associated with hospitalization. Prevalence of enteric cryptosporidiosis was 260/1,918 (13.6%) (>80% Cryptosporidium hominis). Of the 236 children who had sputum available for analysis, 62 (26.3%) had Cryptosporidium in the sputum, only two of whom had HIV infection. Children with Cryptosporidium in the sputum were more likely to have abnormal oxygen saturation at presentation (SpO2 <96%; P = 0.053); no other differences in frequency or severity of respiratory signs were noted. No alternative bacterial cause of respiratory symptoms was identified in 37.7% of children with respiratory cryptosporidiosis, compared with 23.6% of children without (P = 0.04). Sputum-positive children had twice the odds of hospitalization compared with children without Cryptosporidium infection at this site (adjusted odds ratio = 2.08, 95% confidence interval: 1.02-4.22; P = 0.043). Respiratory tract involvement is common in children with intestinal cryptosporidiosis who are experiencing respiratory symptoms. Such children may experience some degree of respiratory compromise and may be at increased risk for hospitalization.Respiratory cryptosporidiosis is considered an occasional, late-stage complication of HIV/AIDS. This study aimed to assess the clinical importance of respiratory cryptosporidiosis in children with diarrhea and respiratory symptoms at Mulago Hospital, Kampala, Uganda. Children aged 9 to 36 months presenting with diarrhea and cough or unexplained tachypnea (N = 1,918) were screened for fecal Cryptosporidium using polymerase chain reaction (PCR). Children with positive stool samples were eligible for further diagnostic tests, including sputum induction. Sputum samples were subjected to PCR for Cryptosporidium, as well as routine microbiology (culture and gram stain) and auramine stain for tuberculosis. Regression analyses were used to investigate 1) factors associated with respiratory cryptosporidiosis and 2) whether respiratory cryptosporidiosis was independently associated with hospitalization. Prevalence of enteric cryptosporidiosis was 260/1,918 (13.6%) (>80% Cryptosporidium hominis). Of the 236 children who had sputum available for analysis, 62 (26.3%) had Cryptosporidium in the sputum, only two of whom had HIV infection. Children with Cryptosporidium in the sputum were more likely to have abnormal oxygen saturation at presentation (SpO2 <96%; P = 0.053); no other differences in frequency or severity of respiratory signs were noted. No alternative bacterial cause of respiratory symptoms was identified in 37.7% of children with respiratory cryptosporidiosis, compared with 23.6% of children without (P = 0.04). Sputum-positive children had twice the odds of hospitalization compared with children without Cryptosporidium infection at this site (adjusted odds ratio = 2.08, 95% confidence interval: 1.02-4.22; P = 0.043). Respiratory tract involvement is common in children with intestinal cryptosporidiosis who are experiencing respiratory symptoms. Such children may experience some degree of respiratory compromise and may be at increased risk for hospitalization. MEDLINE - Academic
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    Cryptosporidiosis and Microsporidiosis in Ugandan Children with Persistent Diarrhea with and Without Concurrent
    (The American Society of Tropical Medicine and Hygiene, 2005) Bakeera-kitaka, Sabrina; Tumwiine, James K.; Ketiniinwa, Addy; Ndeezi, Grace; Downning, Robert; Xiaochun, Feng; Akioshi, Donna K.; Tzipori, Saul
    Cryptosporidium spp. and Enterocytozoon bieneusi are enteric pathogens that have emerged as significant causes of persistent diarrhea (PD) in immunologically compromised individuals particularly in association with HIV/ AIDS. We conducted a cross-sectional study on the clinical epidemiology of E. bieneusi and Cryptosporidium in children with PD, with and without HIV/AIDS, attending Uganda’s Mulago National Referral Hospital. Two hundred forty-three children aged < 60 months, admitted between November 2002 and May 2003 with PD (> 14 days), were analyzed for HIV status and CD4 lymphocyte counts, and stools were screened for the presence ofE. bieneusi and Cryptosporidium by microscopy and positive samples genotyped by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. Eighty (32.9%) of the children were excreting E. bieneusi, and 76 (31.3%) were excreting Cryptosporidium. Ninety-one of the 243 children had HIV, of who 70 (76.9%) had E. bieneusi, versus 10 (6.6%) of the 152 without (odds ratio 47.33; 95% CI 19.88 to 115.97), while 67 (73.6%) had Cryptosporidium, versus 9 (5.9%) without (odds ratio 44.36; 95% CI 18.39 to 110.40). Children with counts < 25% CD4 cells were more likely to have either E. bieneusi (odds ratio 7.42; 95% CI 3.77 to 14.69) or Cryptosporidium (odds ratio 6.45; 95% CI 3.28 to 12.76) than those with higher CD4 percentages. However, only HIV status was independently associated with either Cryptosporidium or E. bieneusi. Among the 243 children with PD, 67 (27.8%) were infected with both enteric pathogens, with HIV being the only independent predictor of coinfection. Finally, some 81% of HIV-infected children with PD excreted one or both organisms, compared with only 10% of children with PD testing negative for HIV. Seventy-four percent of isolates were C. hominis, the anthroponotic species, 17% were C. parvum, the zoonotic species, and 8% were a mixture of the two or others.
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    Microsporidiosis and Malnutrition in Children with Persistent Diarrhea, Uganda
    (2009) Mor, Siobhan M.; Tumwine, James K.; Naumova, Elena N.; Ndeezi, Grace; Tzipori, Saul
    Enterocytozoon bieneusi is an important cause of persis- tent diarrhea, intestinal malabsorption, and wasting in HIV-positive adults. Mucosal damage associated with mi- crosporidiosis is more extensive than that related to other opportunistic intestinal infections (1,2) and leads to sub- stantial malabsorption of carbohydrates, fat, and essential nutrients (2–5). Although microsporidiosis is common in children <5 years of age, particularly those who live in de- veloping countries (6,7) or who are HIV positive (6,8,9), the effects of infection on nutritional health of these vulner- able populations are not well documented. We reexamined anthropometric data of children in Uganda with persistent diarrhea (6) and used regression analysis to determine whether there is an association between microsporidiosis and reduced growth rates.