From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

Figure 5.8. Choropleth maps of infant mortality in 1991 in North Carolina according to different means of interval determination. (A) Intervals are determined by natural breaks. (B) The range of rates is divided into five equal divisions. (C) The number of observations (100 counties) is divided into five equal groups, or quintiles. (D) Standard deviations from the mean value for infant mortality determine the intervals. From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

Plate 11. (a) Areas reporting H5N1 avian influenza cases, 2003–2015 Plate 11. (a) Areas reporting H5N1 avian influenza cases, 2003–2015. Data from WHO (ww.who.int/ influenza/human_animal_interface/EN_GIP_20150717cumulativeNumberH5N1cases.pdf?ua=1). (b) Cases of H1N1 influenza in July 2009. Data from WHO (www.who.int/csr/don/h1n1_20090706a_1100.png). From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.

Plate 12. Dispersed and clustered social networks Plate 12. Dispersed and clustered social networks. With the first case introduced into a community (at the center of the graph), the figures show the location and date of infection. The legend bar indicates the number of days for any individual to become infected. Each dot is an individual; the red ones are infected early, and the blue ones later. The two dispersion patterns are results of different social networks of human contact. Used by permission of Ling Bian. From Health and Medical Geography, 4th edition, by Emch, Root, & Carrel. Copyright 2017 by The Guilford Press.