Fig. 1

Map showing the regions and RSV surveillance sites (Left) and county outlines (right): 1—Mombasa, 2—Kwale, 3—Kilifi, 4—Tana River, 5—Lamu, 6—Taita Taveta, 7—Garissa, 8—Wajir, 9—Mandera, 10—Marsabit, 11—Isiolo, 12—Meru, 13—Tharaka Nithi, 14—Embu, 15—Kitui, 16—Machakos, 17—Makueni, 18—Nyandarua, 19—Nyeri, 20—Kirinyaga, 21—Murang’s, 22—Kiambu, 23—Turkana, 24—West Pokot, 25—Samburu, 26—Trans Nzoia, 27—Uasin Gishu, 28—Elgeyo Marakwet, 29—Nandi, 30—Baringo, 31—Laikipia, 32—Nakuru, 33—Narok, 34—Kajiado, 35—Kericho, 36—Bomet, 37—Kakamega,38—Vihiga,39—Bungoma, 40—Busia, 41—Siaya, 42—Kisumu, 43—Homabay, 44—Migori, 45—Kisii, 46—Nyamira, 47—Nairobi