Fig. 2

The Morbidity and Mortality Weekly Report (MMWR) week is the week of the epidemiologic year for which the National Notifiable Diseases Surveillance System (NNDSS) disease report is assigned by the reporting local or state health department for the purposes of disease incidence reporting and publishing [36]. Values range from 1 to 53, although most years consist of 52 weeks. The weeks shown in the figure above are for example only, as MMWR weeks and corresponding calendar date may shift year to year