Malaria Situation in Nancowry Islands After Tsunami
Author Information
Author(s): Manimunda Sathya Prakash Sugunan, Attayoor Purushottaman, Sha Wajid Ali, Singh Shiv Shankar, Shriram Ananganallur Nagarajan, Vijayachari Paluru
Primary Institution: Regional Medical Research Centre (ICMR), Port Blair, Andaman and Nicobar Islands, India
Hypothesis
What are the reasons for the increase in malaria cases in Nancowry Islands following the tsunami?
Conclusion
The study found that the influx of migrant workers and environmental changes post-tsunami contributed to a significant increase in malaria cases.
Supporting Evidence
- Malaria incidence increased significantly in the post-tsunami year of 2005.
- The percentage of Plasmodium falciparum increased from 23% to 53% from 2006 to 2007.
- 75% of migrant laborers reported having fever in the past month.
- Post-MRT, there was a decline in malaria cases, but it did not last long.
- High transmission settings were identified in Nancowry Islands.
- Environmental changes due to the tsunami created favorable conditions for malaria transmission.
- 90% of the population received mass radical therapy (MRT).
- Statistically significant differences in malaria incidence were found between migrant laborers and indigenous tribes.
Takeaway
After the tsunami, many workers came to Nancowry Islands, and they got sick with malaria because the area was already a high-risk place for the disease.
Methodology
The study involved a retrospective analysis of malaria trends from 2001 to 2008, acute malaria situation analysis, and a rapid survey of fever and malaria parasitemia.
Potential Biases
Potential bias due to low health-seeking behavior among indigenous tribes.
Limitations
The study did not examine the entomological aspects and faced logistical challenges in covering a larger sample.
Participant Demographics
The population included 4875 Nicobarese tribes and around 600 migrant male laborers aged 18 to 55.
Statistical Information
P-Value
p<0.01
Confidence Interval
95% CI:10.1, 14.2
Statistical Significance
p<0.01
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