Positive culture rate and antimicrobial susceptibilities of Mycoplasma hominis and Ureaplasma urealyticum

OBJECTIVE: To assess positive culture rate and antimicrobial susceptibilities of Mycoplasma hominis (MH) and Ureaplasma urealyticum (UU) in symptomatic general population and pregnant women admitted with preterm labor and premature rupture of membranes. METHODS: We retrospectively reviewed medical records of patients who have undergone culture test and antimicrobial susceptibilities at our center from January 2017 to April 2018. Patients with positive culture for MH, UU, or both were included in this study. RESULTS: There were 200 patients who were eligible for enrollment. Of these patients, 34 (17%) were pregnant women and 166 (83%) were non-pregnant women. Of these 200 patients, positive culture results were as follows: MH only, n=10 (5%); UU only, n=58 (29%); and both MH and UU, n=36 (18%). Susceptibilities of MH only to doxycycline, erythromycin, ciprofloxacin, and azithromycin were 100%, 10%, 40%, and 0%, respectively. Susceptibilities of UU only to doxycycline, erythromycin, ciprofloxacin, and azithromycin were 94.8%, 87.9%, 5.2%, and 81%, respectively. Susceptibilities of both MH and UU to doxycycline, erythromycin, ciprofloxacin, and azithromycin were 97.2%, 5.6%, 11.1%, and 11.1%, respectively. CONCLUSION: UU only was the leading causative pathogen for genitourinary infection in our study. MH only accounted for about one sixth of UU only infections. Doxycycline was still the best antibiotics as most patients with MH only, UU only, or both MH and UU positive culture showed susceptibility. For ciprofloxacin, less than 12% of those with UU only and both MH and UU culture positive results showed susceptibility.

Improvement of the Positive Culture Rate Using New Enriched Broth in Cellulitis / 대한피부과학회지

BACKGROUND: Staphylococcus aureus and Group A beta-hemolytic Streptococci are the etiologic agents most commonly associated with cellulitis, but many other bacteria have also been shown to cause this condition. The positive bacterial culture rate is the most important factor in the treatment of cellulitis. However, the positive bacterial culture rate in the commonly used media, tends to be quite low. OBJECTIVE: The principal objective of this study was to improve the positive culture rate in cellulitis patients by using a new enriched broth. METHODS: Brewer modified thioglycollate medium (BTM) and Columbia broth (CB), both of which are widely utilized in clinical bacteriology for enriched growth, were compared with several novel enriched broths. These new enriched broths were mixtures of BTM-CB broth and added growth supplement factors. They included BTM-CB (BC), Modified BTM-CB (MBC) and supplement VX-BTM-CB (VXBC). MBC media included several growth supplements, such as hemin, vitamin K1, VX supplement, and Campylobacter growth supplement. Strains utilized in this study were common pathogens (Staphylococcus aureus, Streptococcus pyogenes, et al.), anaerobes, fastidious pathogens (Bacteroides fragilis, Campylobacter jejuni, Prevotella melaninogenica), uncommon pathogens (Actinobacter baumannii, Enterococcus faecalis, Streptococcus agalactiae). Positive culture rates were evaluated in each medium and measured via spectrophotometry at 660 nm. RESULTS: In vitro, all strains used in this study grew more quickly and densely in MBC media. CONCLUSION: Our results suggest that MBC media in a new enriched broth may improve bacterial culture rates in cellulitis patients. It will be necessary to study the efficacy of the MBC media in the culturing etiologic agents from tissues of cellulitis patients.

Value of Peracetic Acid (SCOTELIN(R)) for Endoscope Disinfection / 대한소화기내시경학회지

BACKGROUND/AIMS: Two percent glutaradehyde has been the reference disinfectant for high-level disinfection, but often requires long period of exposure up to 45 minutes. The aims of this study were to evaluate the effectiveness of a new endoscope disinfectant that uses 0.2% peracetic acid, and to compare the culture-positive rate in each different endoscopes and washers used. MEHTODS: Three endoscopes and two washers that differed in purchase year were used. They were cleansed manually and disinfected with peracetic acid for 10 minutes. A total of 86 gastroduodenal endoscopic sessions were included in the study. RESULTS: Overall culture-positive rate was 37.2%, majority of which came from washings of biopsy channel. There was a significant difference in culture-positive rate according to the machine used. Culture positive rate was 11.4% in recently purchased endoscope and washer used. Of the 28 Helicobactor pylori positive cases, there was one Helicobactor pylori DNA PCR positive case, but no Helicobactor pylori was found. CONCLUSIONS: When new endoscope and washer is used, peracetic acid is effective as a disinfectant. Significant difference in culture rate according to the different machine used might come from the aging effect and difference of cleansing power of the washer.