 |
| About Bioline | All Journals | Testimonials | Membership | News |
|
||||||
|
||||||
Indian Journal of Medical Microbiology, Vol. 25, No. 1, January-March, 2007, pp. 75-76 Correspondence Changing serotypes and phage types of Vibrio cholerae in Ludhiana (Punjab) during 2001-2005 Oberoi A, Aggarwal A Department of Microbiology, Christian Medical College and Hospital, Ludhiana - 141 008, Punjab Date of Submission: 29-Sep-2006 Code Number: mb07025 Dear Editor, We report a change in serotypes and phage type of Vibrio cholerae islated in CMC, Ludhiana. V. cholerae O139 emerged as a pathogen and has been reported from various parts of India.[1] The organism isolated most frequently was Eltor biotype of O1 V. cholerae, usually of the Ogawa serotype. The factors that predispose to epidemics are poor sanitation, malnutrition, over-crowding, and inadequate medical services.[2] In this communication, we report V. cholerae O139 as predominant emerging pathogen in 2004 and altogether changing serotypes of V. cholerae O1 in 2005. The stool samples from patients of diarrhea both (indoor and outdoor patients) received in the Microbiology Department of Christian Medical College and Hospital, Ludhiana were processed. Organisms were identified by standard recommended techniques.[3] All the V. cholerae isolates were sent to the National Institute of Cholera and enteric diseases, Calcutta, for phage typing. V. cholerae isolated during years 2001-2005 are shown in the Table. A great diversity of V. cholerae isolates was observed during this period. An outbreak of gastroenteritis usually occurs in Ludhiana (Punjab) from June to August every year. A total of 45 and 37 V. cholerae were isolated in 2001 and 2002, respectively, and all were V. cholerae O1 Eltor ogawa. This pattern showed a change in 2003, when O139 also emerged as a pathogen isolated from 19 out of a total of 70 isolates of V. cholerae . While in year 2004, whole pattern of V. cholerae isolates changed with 120 isolates of V. cholerae 0139 and Inaba serotype was also isolated (29/150) and one was Eltor ogawa. In 2005, all 34 isolates of V. cholerae were Eltor O1 Inaba and none was Non O1. There is change in phage types of the isolates also which is epidemiologically significant. In 2001, all 45 isolates of V. cholerae belonged to phage type 2 (according to Basu and Mukerjee) and 26 were to phage type 27, 5-23, 2-4, one each to 21, 19, 25, respectively, (according to New scheme) while in 2005 all the strains of V. cholerae isolated belonged to phage type 4 (Basu and Mukerjee) and 24 to phage type 27, 1 to phage type 4 (New scheme). Same diversity of V. cholerae strains was observed in 2000 and 2001 in Hyderabad showing a peak isolation of V. cholerae O139 in months of June and July 2000 and 2001. Emergence of V. cholerae O1as seen in our report is comparable with that observed by Jesudasen in the year 2004-2005.[4] The pattern of phage typing nearly coincides with that of study reported by Sundaram et al .[5] Variation from Inaba to Ogawa otherwise can take place during excretion by the individual or with course of a localized outbreak as in evident from the change in this pattern in last two years in this institution. In this study all isolates are O1 Inaba, while isolates from Vellore during same period were O1 Ogawa.[4] It can be concluded from this study that both V. cholerae O1 and O139 have the ability to survive during inter-epidemic periods and have epidemic potential, thus necessitating constant surveillance. References
Copyright 2007 - Indian Journal of Medical Microbiology The following images related to this document are available:Photo images[mb07025t1.jpg] |
| |||||||||
