identifying geographic areas at risk of soil- transmitted ...€¦ · presentation overview 2...
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M A X J . M O R E N O M A D R I Ñ Á N , M O H A M M A D Z . A L - H A M D A N , D A V I D G . P A R A J Ó N , D O U G L A S . L . R I C K M A N , J E F F R E Y L U V A L L , S U E E S T E S , A N D E R I K A P O D E S T N A S A - A P P L I E D S C I E N C E S P R O G R A M N S S T C / M S F C / N A S A S A N T A F E , N M , 9 / 1 4 / 2 0 1 1
Identifying Geographic Areas at Risk of Soil-transmitted Helminthes Infection Using MODIS
Products: Boaco, Nicaragua as a Case Study
https://ntrs.nasa.gov/search.jsp?R=20120001653 2020-06-05T17:04:41+00:00Z
Presentation Overview
2
Background of the Diseases Neglected Diseases Sanitation Health Impact
Study Area Boaco, Nicaragua
Remote Sensing MODIS Land Surface Temperature (LST) MODIS Normalized Difference Vegetation Index (NDVI) MODIS Land Cover Land Use Type (LCLU)
Results Conclusions Future Studies
Background
3
Environment is a major factor for health, both directly or indirectly Sanitation, poverty, neglected diseases Natural environment
A number of agents of diseases are carried by vectors and reservoirs whose viability depends on given environmental conditions
Such conditions describe not only the characteristics of the natural environment but also of sanitation
Such conditions can be inferred with satellite data
Source: Thor Axel Stenström, 2009
* WHO, 2002. The World Health Report: Reducing Risks , Promoting Healthy Life
Temperature
Presences of water bodies
Soil moisture
Vegetation
Elevation
Precipitation
Soil transmitted helminthes infection, Helminthiasis, Neglected Diseases
Impact Reduced physical growth Weak physical fitness Impaired cognitive functions Increase with intensity of
infections
1.UNICEF, 2006. Progress for Children
Background cont.
Microscopic Evaluation
Ascaris suum zygotes inactivated
Ascaris suum developed larva
5 Photos Courtesy of Dr. Ligia Cruz Espinoza
Background cont.
http://curezone.com/image_gallery/parasites/ascaris/
Background cont.
Background cont. Ascaris lumbricoides
Life cycle
2 to 3 months after ingestion of the eggs, the mature worms commence egg laying in the intestine
2 or 3 weeks outside the host to develop to the infective stage
Ascaris lumbricoides
Ancylostoma duodenale
Trichuris trichiura
Soil
Necator americanus
Background cont.
Study Area Ascaris lumbricoides Trichuris trichiura Ancilostoma duadenale
MODIS Land Surface Temperature (LST) 1:30 pm
MYD11A1 1 km daily
Ascaris lumbricoides Trichuris trichiura Ancilostoma duadenale
MODIS Land Surface Temperature (LST) 1:30 pm
MYD11A1 1 km daily
Study Area
Remote Sensing Ascaris lumbricoides Trichuris trichiura Ancilostoma duadenale
MODIS Land Surface Temperature (LST) 1:30 pm
MYD11A1 1 km daily
Remote Sensing Ascaris lumbricoides Trichuris trichiura Ancilostoma duadenale
MODIS Normalized Difference Vegetation Index (NDVI)
MYD13Q1
250 m
16 day
Remote Sensing Ascaris lumbricoides Trichuris trichiura Ancilostoma duadenale
MODIS Land Cover Land Use Type (LCLU)
MCD12Q1 Combined
500 m
Yearly
LST Thrichuris trichuria Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.0157
t Approximation
Pr > |z| 0.0161
Kruskal-Wallis Test
Pr > Chi-Square 0.0156
Positive: n=152 mean=26.27
Negative: n=244 mean=26.47
0
10
20
30
40
50
60
70
80
90
Fre
cuen
cy
Temperature Celsius
Negative
Positive
LST Ascaris lumbricoides Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| < 0.0001
t Approximation
Pr > |z| 0.0001
Kruskal-Wallis Test
Pr > Chi-Square <0.0001
Positive: n=111 mean=26.13
Negative: n=285 mean=26.49
0
10
20
30
40
50
60
70
80
90
Fre
cuen
cy
Temperature Celsius
Negative
Positive
LST Ancilostoma duodenale Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.7824
t Approximation
Pr > |z| 0.7825
Kruskal-Wallis Test
Pr > Chi-Square 0.7813
Positive: n=10 mean=26.61
Negative: n=386 mean=26.39
0
10
20
30
40
50
60
70
80
90
Fre
cuen
cy
Temperature Celsius
Negative
Positive
NDVI Trichuris trichuria Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.029
t Approximation
Pr > |z| 0.0301
Kruskal-Wallis Test
Pr > Chi-Square 0.295
Positive: n=152 mean=0.756
Negative: n=244 mean=0.765
0
10
20
30
40
50
60
70
80
Fre
cuen
cy
NDVI
Negative
Positive
NDVI Ascaris lumbricoides Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.6
t Approximation
Pr > |z| 0.1054
Kruskal-Wallis Test
Pr > Chi-Square 0.1045
Positive: n=111 mean=0.760
Negative: n=285 mean=0.761
0
20
40
60
80
100
120
Fre
cuen
cy
NDVI
Negative
Positive
NDVI Ancilostoma duodenale Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.7656
t Approximation
Pr > |z| 0.7658
Kruskal-Wallis Test
Pr > Chi-Square 0.7646
Positive: n=10 mean=0.777
Negative: n=386 mean=0.761
0
10
20
30
40
50
60
70
80
90
100
0.42
815
0.45
1686
842
0.47
5223
684
0.49
8760
526
0.52
2297
368
0.54
5834
211
0.56
9371
053
0.59
2907
895
0.61
6444
737
0.63
9981
579
0.66
3518
421
0.68
7055
263
0.71
0592
105
0.73
4128
947
0.75
7665
789
0.78
1202
632
0.80
4739
474
0.82
8276
316
0.85
1813
158
Mor
e
Fre
cuen
cy
NDVI
Negative
Positive
Land Class
Posit. Negat. Odd ratio
n Prevalence
2 44 54 0.814 98 0.45
8 48 69 0.695 117 0.41
12 6 10 0.6 16 0.37
14 91 74 1.23 165 0.55
Wilcoxon Two-Sample Test:
Normal Approximation
Pr > |z| 0.7656
t Approximation
Pr > |z| 0.7658
Kruskal-Wallis Test
Pr > Chi-Square 0.7646
Positive: n=10 mean=0.777
Negative: n=386 mean=0.761
