1c:I[419806,["/_next/static/chunks/bb923814e1f4d2e9.js","/_next/static/chunks/dd3ee9f5b7716ca6.js","/_next/static/chunks/4204a0ae82542ca8.js","/_next/static/chunks/1270dead247da766.js","/_next/static/chunks/6e1aa89a642f40be.js","/_next/static/chunks/2d7aa753e81324a8.js","/_next/static/chunks/8ffd0b71567920d8.js","/_next/static/chunks/67ea6dfd21f16c5f.js","/_next/static/chunks/24eb4379f68013fd.js","/_next/static/chunks/b8cd775ffdf935bd.js","/_next/static/chunks/983103cd9eb7b428.js","/_next/static/chunks/263f2cdcb9aa2341.js","/_next/static/chunks/294b9525248c8e5f.js"],"default"] 1d:T446,Introduction to microbiology Part 1 - the role of microbiology laboratory in the diagnosis of infectious diseases - guidelines to practice and management introduction to microbiology Part 2 - guidelines for the collection, transport, processing, analysis, and reporting of cultures from specific specimen types the enterobacteriaceae the nonfermentative gram-negative bacilli curved gram-negative bacilli and oxidase-positive fermenters - compaylobacters and bivrionaceae haemophilus miscellaneous fastidious gram-negative bacilli legionella neisseria and morxaella catarrhalis the gram-positive cocci Part 1 - staphylococci and related organisms the gram-positive cocci Part 2 - streptococci and streptococcus-like bacteria the aerobic gram-positive bacilli the anaerobic bacteria antimicrobial susceptibility testing mycoplasmas and ureaplasmas mycobacteria spirochetal infections mycology parasitology diagnosis of infections caused by viruses, chlamydia, rickettsia, and related organisms current rapid techniques and emerging technologies in the laboratory diagnois of infectious diseases.1e:T4c2,A total of 19,252 stool specimens from 12,136 patients were examined by direct microscopy and the ethyl acetate-Formalin concentration method during the last 2 years. All liquid specimens and those in which parasite identification was difficult or equivocal were also examined in trichrome-stained preparations. A total of 3,070 intestinal parasites were seen in 2,889 patients. Blastocystis hominis was found in fecal material from 647 patients (17.5%). A total of 132 cases (25.6%) were observed to be in association with other enteric pathogens. B. hominis in large numbers was present as the only parasite or with other commensals in 515 specimens from patients (79.6%). Of these patients, 239 (46.4%) had symptoms, the most common being abdominal pain (87.9%), constipation (32.2%), diarrhea (23.4%), alternating diarrhea and constipation (14.5%), vomiting (12.5%), and fatigue (10.5%). Forty-three (18%) of the patients were treated with metronidazole (0.5 to 1.0 g/day) because of recurrent symptoms and the presence of large numbers of B. hominis cells in repeated stool specimens. After 7 to 10 days of treatment, all patients became asymptomatic with negative stools on follow-up examinations for B. hominis.1f:T42c,The association ofBlastocystis hominiswith human disease is controversial. Many studies^1-9have reported its association with gastrointestinal symptoms such as diarrhea, abdominal cramps, vomiting, and weight loss. Other reports^10,11doubt its clinical pathogenicity. To our knowledge, invasive B hominis has not been found in humans. We describe a patient whose biopsy specimen was positive forB hominiscolonic ulceration, which produced rectal bleeding and protein-losing enteropathy. Patient Report.A previously healthy 4-year-old girl was hospitalized with a 3-week history of rectal bleeding. The illness started with blood-streaked stools, which progressed to watery stools, five to six times a day, and blood clots. There was no history of abdominal pain, fever, nausea, vomiting, lethargy, decreased appetite, or prior antibiotic treatment. One week before admission to Texas Children's Hospital (Houston), she was seen in another hospital for fever and watery diarrhea with blood streaks. The results of the diagnostic20:T455,Blastocystis hominis, a protozoan whose pathogenicity has been questioned, is sometimes found in the

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