Investigation of acute diarrhoea outbreak at Narasapura, Kolar
Keywords:Outbreak, Cholera, Outbreak investigation, Narasapura
Background: Greatest risk of acute diarrhea outbreaks occurs in over-populated communities & refugee settings characterized by poor sanitation, unsafe drinking-water and increased person to person transmission. Because the incubation period is very short, number of cases can rise extremely quickly and it calls for a prompt and thorough investigation. There were reports of cases of acute diarrhoea and based on the preliminary field work, the existence of an outbreak was confirmed. Hence it was decided to investigate the outbreak with objectives to determine the causes and source of acute diarrhoea outbreak at Narasapura village in Kolar and to suggest control measures.
Methods: The cross sectional study was conducted in Narasapura village of Kolar which is a fast growing industrial area. All the households and migratory settlements of the affected area were included. Attack rates of the disease were computed, epidemic curve drawn and the results were analyzed to draw conclusions. Control measures were applied simultaneously.
Results: The diarrhoea attack rate at AD colony was 10%. Males (65%) were more affected compared to females (35%). 15.4% stool samples were positive for Vibrio cholera and 18% of the water samples was found to be non-portable. Vibrio cholerae O1 biotype El Tor serotype Ogawa strain was implicated as the cause for present outbreak.
Conclusions: Cholera continues to be a public health problem in migratory settings, causing disease outbreaks. Environmental risk factors and lack of awareness are the contributory factors which need to be addressed.
Detels R, Gulliford M, Karim QA, Tan C. Oxford Textbook of Global Public Health. 6th ed. Oxford university press: Oxford; 2015.P442-55.
Park K. Textbook of preventive and social medicine. 23rd ed. Jabalpur; Bhanot: 2015: 221-228.
Central Bureau of Health Intelligence (2015). National health profile 2015. New Delhi: Ministry of Health and Family Welfare, Government of India. Available at: www.cbhidghs.nic.in. Accessed on 23 September 2016.
Govt of India (2014), National Health Profile, DGHS, Central bureau of health intelligence, Ministry of Health & Family Welfare. Available from http://www.mohfw.nic.in. Accessed on 23 September 2016.
Cholera outbreak. Assessing the outbreak response and improving preparedness. Global task force on cholera control. World Health Organization. Geneva. 2004: 6-9.
Verma R, Singh B, Bhalla K, Kamal M. Epidemiological lesson learnt: Diarrhea outbreak Investigation in a remote village of district Rewari (Haryana), India. Int J Basic Applied Med Sci. 2015;5(1):103-7.
Bhandari GP, Ghimire U, Maskey MK. Outbreak Investigation of Diarrheal Diseases in Jajrkot. J Nepal Health Res Council. 2005;7:66-78.
Patil SB, Deshmukh D, Dixit J, Damle A. Epidemiological Investigation of an Outbreak of Acute Diarrheal Disease: A Shoe Leather Epidemiology. J Global Infect Dis. 2011;3(4):361-5.
Bara D, Dhariwal AC, Jain DC, Sachdeva V, Vohra JG, Prakash RM, et al. Vibrio cholerae 01 outbreak in remote villages of Shimla district, Himachal Pradesh, 1994. J commun Dis. 1997;29:121–5.
Khera AK, Jain DC, Datta KK. Profile of epidemic emergencies in India during 1991 - 1995. J Commun Dis. 1996;28:129–38.
Ghosh S, Sircar BL. Investigation of an outbreak of acute diarrhoeal disease in Malda district of West Bengal. National Institute of Cholera and Enteric disease (NICED), Kolkata Annual Report. 2003-2004.
Radhakutty G, Sircar BK, Mondal SK, Mukhopadhyay AK, Mitra RK, Basu A, et al. Department of Microbiology, T.D. Medical College, Alleppey Investigation of cholera outbreak in Alleppey and Palghat district, South India. Indian J Med Res. 1997;106:455–7.
Map of Kolar Available at: https://www. veethi.com/places/karnataka-kolar-district-78.htm. Accessed on 23 September 2016.