A clinical comparison of typhoid fever caused by susceptible and multidrug-resistant strains of Salmonella typhi.

The clinical features and response to therapy with ciprofloxacin were studied in two groups of patients: those infected by susceptible strains of Salmonella typhi and others infected by multidrug-resistant strains. There was no significant difference in the clinical presentation, laboratory findings and outcome between the two groups. Patients infected with multidrug-resistant strains, however, defervesced in significantly longer time (5.5 days) than those infected by susceptible strains (4.35 days) (p = 0.031). In areas with high prevalence of multidrug-resistant Salmonella infection, empiric treatment with quinolones or third-generation cephalosporins of all patients with suspected typhoid fever until the results of culture sensitivity tests are available may lead to better outcome.

Vertebral osteomyelitis in Qatar.

Twenty-eight cases of vertebral osteomyelitis were diagnosed at Hamad General Hospital in Qatar between January 1988 and December 1991: 16 (57.2%) cases were tuberculous spondylitis, 6 (21.4%) Brucella spondylitis, 3 (10.7%) Staphylococcus aureus spondylitis, 2 (7.1%) Salmonella spondylitis, and 1 (3.6%) Pseudomonas cepacia spondylitis. Plain vertebral x-ray films and CT scans were abnormal in all patients. Bone and gallium scans were abnormal in 87.5% and 64% of cases respectively. Clinical manifestations, haematological and radiological investigations were not able to differentiate between the causes. Serological tests were helpful in diagnosing Brucella spondylitis. CT-guided needle biopsy was able to identify the aetiology in 90% of cases. We conclude that invasive tests are still needed to establish the microbiological diagnosis and to guide antimicrobial therapy in most cases of vertebral osteomyelitis.

Pyogenic sacroiliitis in Qatar.

We describe our experience in handling six cases of pyogenic sacroiliitis. Two were males and four were females with a mean age of 24.9 years. None had a history of i.v. drug abuse. Blood cultures were positive in half of the patients. The sacroiliac joint aspirate was positive in one additional patient. Staphylococcus aureus was recovered from three of four culture positive cases. Bone and CT scans revealed abnormalities in all patients. Response to antibiotic therapy was satisfactory in all except one patient who had an early relapse. Early diagnoses and proper treatment would result in improved outcomes.

Strongyloides stercoralis hyperinfection in a patient with angioimmunoblastic lymphadenopathy.

A 29 year old Bengali male patient on chemotherapy for angioimmunoblastic lymphadenopathy developed Strongyloides hyperinfection syndrome 3 months after being treated with a single 3 day course of thiabendazole. His complicated hospitalization and successful management are described. Prevention of this potentially fatal disease in immunocompromised patients by early diagnosis and proper management of intestinal strongyloidiasis is emphasized.

Randomized prospective study comparing two dosage regimens of ciprofloxacin for the treatment of typhoid fever.

Sixty-two patients with blood culture-proven typhoid fever were randomly assigned to receive either 500 or 750 mg of ciprofloxacin orally, twice daily for 7 days or for two days following defervescence, whichever was greater. Thirty-four and 28 patients received 500 mg and 750 mg respectively. Strains of Salmonella typhi resistant to ampicillin, chloramphenicol and co-trimoxazole were isolated from the blood of 27 patients (43.5%). No resistance to ciprofloxacin was encountered. Both regimens were equally effective; fever subsided in mean times of 4.9 +/- 1.7 days in the 500 mg group and 5.2 +/- 2.2 days in the 750 mg group (P = 0.54). All patients were cured, although one patient in the 750 mg group experienced a presumed relapse two months following completion of therapy. Ciprofloxacin administered for 7-10 days was adequate treatment for 57 of the 62 patients (92%); only five patients required therapy for more than 10 days. Patients with pretreatment symptoms of > or = 10 days duration defervesced in a mean of 5.7 +/- 2.3 days compared with 4.5 +/- 1.3 days (P = 0.01) for those with symptoms of shorter duration. We conclude that 500 mg of ciprofloxacin taken orally twice daily is adequate treatment for typhoid fever.

The emergence of antimicrobial resistant Salmonella typhi in Qatar: epidemiology and therapeutic implications.

Multiresistant Salmonella seems to be a growing problem in Qatar and its treatment remains problematic. Of 100 Salmonella bacteraemias that occurred between 1 October 1989 and 30 September 1990, 30 were caused by S. typhi resistant to one or more of the conventional antibiotics usually recommended for the treatment of typhoid fever (ampicillin, chloramphenicol, and trimethoprim-sulphamethoxazole). Of those, 25 (83%) were acquired by patients during visits to the Indian subcontinent. Two patients with isolates sensitive to ampicillin were successfully treated with amoxicillin, 6 paediatric patients were cured with cefotaxime, and 20 adult patients responded favourable to ciprofloxacin. A 9 year old boy failed initial therapy with cefuroxime but responded well to ciprofloxacin. One adult patient was treated successfully with a combination of ciprofloxacin and cefotaxime. We conclude that cefotaxime and ciprofloxacin can serve as first line therapy for typhoid fever in areas where multi-resistant Salmonella is prevalent.

Ceftriaxone in the treatment of acute and subacute human brucellosis.

A total of 14 adults were diagnosed as having brucellosis by clinical means, serology and blood culture. The first patient to be treated failed to respond to 2 g/day intravenous ceftriaxone, therefore, subsequent patients were treated intravenously, twice daily with 2 g ceftriaxone. Immediate clinical response was seen in nine (69.2%) of the patients. Therapy was changed to tetracycline plus streptomycin in the remaining four (30.8%) patients because of lack of response after 5 days. It is concluded that ceftriaxone may be considered a second-line therapy for brucellosis in patients who cannot be given conventional therapy. Further evaluation of ceftriaxone, either alone or preferably in combination with streptomycin or rifampicin on a larger scale, is indicated.

Fungemia caused by Candida species and Torulopsis glabrata in the hospitalized patient: frequency, characteristics, and evaluation of factors influencing outcome.

We reviewed 135 cases of candidemia occurring between 1983 and 1986 to examine oncologic and nononcologic populations and assess factors for survival. Candida albicans was the most common species (51%); Candida tropicalis occurred most frequently in leukemia patients (57%), whereas Candida parapsilosis and Torulopsis glabrata were associated with solid tumors and nononcologic diseases. Risk factors identified were: preceding surgery, antibiotics, cannulas, and steroids in solid tumor and nononcologic diseases; and chemotherapy and neutropenia with hematologic malignancies. Even transient cannula-associated candidemia was not a benign process. Intravenous cannulas were common portals of entry (39%) in debilitated patients without cancer (59%) and were associated with high mortality (55%). Overall mortality was 59%, candidemia directly contributing to death in 75% of cases. In patients with candidemia, failure to initiate therapy with amphotericin B had a negative influence on outcome, whereas analysis of the entire group identified severity of underlying illness as the dominant cofactor influencing outcome.