Fig. 1

Map of Kenya showing 8 provinces (colored) and the 47 sub-national units (counties) as dark lines water bodies and major rivers are shown in blue. Coast province: Mombasa [1], Kwale [2], Kilifi [3], Tana River [4], Lamu [5], Taita Taveta [6]; North Eastern province: Garissa [7], Wajir [8], Mandera [9]; Eastern province: Marsabit [10], Isiolo [11], Meru [12], Tharaka Nithi [13], Embu [14], Kitui [15], Machakos [16], Makueni [17]; Central province: Nyandarua [18], Nyeri [19], Kirinyaga [20], Murang’a [21], Kiambu [22]; Rift Valley province: Turkana [23], West Pokot [24], Samburu [25], Trans Nzoia [26], Uasin Gishu [27], Elgeyo Marakwet [28], Nandi [29], Baringo [30], Laikipia [31], Nakuru [32], Narok [33], Kajiado [34], Kericho [35], Bomet [36]; Western province: Kakamega [37], Vihiga [38], Bungoma [39], Busia [40]; Nyanza province: Siaya [41], Kisumu [42], Homa Bay [43], Migori [44], Kisii [45], Nyamira [46]; Nairobi province: Nairobi [47]