Kimberly Thompson, Associate Professor of Risk Analysis and Decision Technology at HSPH, and Radboud Duintjer Tebbens, a extensive research associate at HSPH, used a mathematical model to demonstrate the need for maintaining and increasing the immunization intensity in presently endemic areas. Immunization intensity is an indication of the amount of vaccination effort targeted at increasing population immunity. The authors suggest that even a relatively small reduction in intensity of immunization could lead to relatively huge outbreaks. They emphasized that the world cannot allow up in its vaccination attempts for polio, at least until eradication offers been accomplished.19 additional human cases of West Nile virus have already been confirmed in Arizona A teen-ager from Pinal County is the 57th case of West Nile virus in human beings in Arizona, and general public wellness officials are urging all occupants to take safety measures against the disease. The lady was hospitalized but has been is and discharged recovering. She is the 1st case of West Nile virus in a human beyond Maricopa County this season. Within the last week, 19 additional human instances have been confirmed in Arizona, bringing the full total to 57. The age range of those afflicted is normally three months to 87 years, with a median age of 59.