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Research

Extreme Weather Events

Excessive cold/heat events
We are exploring the relationships between meteorological conditions and spatial-temporal patterns of hospitalizations due to hypothermia in the older adults residing in the USA. Low ambient temperatures and extreme cold spells can cause hypothermia - a common yet preventable condition, resulting in significant morbidity. 74,410 hospitalization records due to hypothermia were mapped over daily meteorological measures abstracted from 1,979 stations nationwide for 14 years.

We have used different classifications of heat waves / heat spells to explore their potential effect on the change of gastro intestinal infections (GI) in the major cities of the US.

Atlantic storms
We have developed methodology for estimating the number of elderly affected by Atlantic storms in 1998-2002 using Geographical Information System. Attempting to document historical status of gastro intestinal infections (GI) among elderly (≥65yo) in the areas affected by Hurricane Katrina in Louisiana and Mississippi, we gathered information from various sources and described GI rates for the two states from 1998 to 2002.

Climate classification
The Köppen climate classification system is the most widely used and understood classification. We have suggested an adaptation of the Köppen climate classification and have demonstrated its utility by describing the incidence of campylobacteriosis, a disease caused by thermo-sensitive bacteria in which diverse seasonal patterns have been observed worldwide. By carefully studying these associations and their underlying mechanisms, we hope to gain insights into the factors that drive the emergence and seasonal/interannual variations in contemporary epidemic diseases and, possibly, to understand the potential future disease impacts of long-term climate change.

These research studies are supported by NIEHS R01ES 013171.

Selected Publications:

Lofgren ET, Wenger JB, Fefferman NH, Bina D, Gradus S, Bhattacharyya S, Naumov YN, Gorski J, Naumova EN. Disproportional effects in populations of concern for pandemic influenza: insights from seasonal epidemics in Wisconsin, 1967-2004. Influenza Other Respi Viruses. 2010 Jul;4(4):205-12.

Wenger JB, Naumova EN. Seasonal synchronization of influenza in the United States older adult population. PLoS One. 2010 Apr 15;5(4):e10187.

Chui KK, Webb P, Russell RM, Naumova EN. Geographic variations and temporal trends of Salmonella-associated hospitalization in the U.S. elderly, 1991-2004: a time series analysis of the impact of HACCP regulation. BMC Public Health. 2009 Dec 3;9:447.   

Jagai JS, Castronovo DA, Monchak J, Naumova EN. Seasonality of cryptosporidiosis: A meta-analysis approach. Environ Res. 2009; 109:465-78.   

Muchiri JM, Ascolillo L, Mugambi M, Mutwiri T, Ward HD, Naumova EN, Egorov AI, Cohen S, Else JG, Griffiths JK. Seasonality of Cryptosporidium oocyst detection in surface waters of Meru, Kenya as determined by two isolation methods followed by PCR. J Water Health. 2009;7(1):67-75.