Surgical site infection; in-vitro anti-bacterial activity of different brands of ceftriaxone against bacteria commonly implicated in surgical site infection and their cost effectiveness

Ceftriaxone is used in wide range of day to day microbial infections in clinical practice3. Despite the incumbent drug regulating authority in Pakistan, there is scanty literature comparing the anti-microbial efficacy of different available br and s of ceftriaxone. Objectives: To know the in-vitro activity of various br and s of ceftriaxone against bacteria most commonly isolated from surgical site infection [SSI]. A comparison of five days cost of these br and s will also be done. Design: Experimental study. Period: Feb 2013 to Aug 2013 Setting: Surgical "C" unit Lady Reading Hospital [LRH] in collaboration with departments of pharmacology Khyber Girls Medical College [KGMC] and microbiology department of Lady Reading Hospital Peshawar. Material and Methods: Isolates of five bacteria i.e. Staphylococcus aureus, Proteus mirabilis, Escherischia coli, enterobacter Spp, and Klebsiella pneumoniae, found sensitive to ceftriaxone were grown on 50 slops each and the zone of inhibition was checked for each of the ten br and s of ceftriaxone. Results: The zones of inhibitions of different br and s of ceftriaxone against the above mentioned bacteria were not significantly different. The cost of therapy was significantly different for ten br and s. Conclusions: Various br and s of ceftriaxone of variable cost had no influence on their activity against bacteria involved in SSI.

Antibiotic sensitivity pattern of Salmonella serotypes in patients with enteric fever in a teaching hospital

To determine the sensitivity of salmonella serotypes to antibiotics in patients with enteric fever. This descriptive study was carried out in medical units of Lady Reading Hospital Peshawar from January 2008 to December 2011. Patients were included by consecutive sampling technique. Blood samples were collected from patients with clinically suspected enteric fever and were sent to hospital laboratory for culture and sensitivity[C/S]. Salmonella colonies were identified using standard biochemical tests including fermentation of glucose, negative urease reaction, lysine decarboxylase, negative indole test, H2S production, and fermentation of dulcitol. Serological confirmation tests included polyvalent antisera for flagellar and somatic antigens. Antibiotic susceptibility was checked by Kirby- Bauer disc diffusion method for 22 antibiotics. Blood cultures of 106[61%] patients out of 173 patients were positive for salmonella species. Salmonella Typhi was found in 54.7% while salmonella paratyphi A in 32.1% and B in 13.2%. The sensitivity of salmonella species for ceftriaxone and ceftazidime was found to be 100%, followed by imipenem[98.1%] and meropenem [96.2%]. The sensitivity of drugs like amoxicillin, chloramphenicol and co-trimaxazolewere 2.8%, 12.3% and 22.6% respectively. Regarding quinolones, most sensitive was moxifloxacin49.1%, followed by ciprofloxacin 48.1%. Salmonella typhi was fully sensitive to meropenum, ceftriaxoneand cetazidime while paratyphi A or B was fully sensitive to ceftriaxone, ceftazidime and imipenem. The sensitivity of salmonella species was very low to the first line agents such as amoxicillin, chloramphenicol and co-trimaxazole. Salmonella species were fully sensitive to third generation cephalosporins such as ceftriaxone and ceftazidime