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Simulation Brings Facts to Measles Outbreak and Vaccination Debate

By R&D Editors | February 17, 2015

A computer simulation explores the impact of measles outbreaks in cities across the U.S. Users can see how an outbreak would play out if their city had high or low vaccination rates.PITTSBURGH, PA — To bring facts and clarity to the public debate about immunization in light of the recent measles outbreak, the University of Pittsburgh Graduate School of Public Health unveiled a computer simulation that explores the impact of measles outbreaks in cities across the U.S. Users can see how an outbreak would play out if their city had high or low vaccination rates.

The simulation — which is easily accessible from mobile devices — is an adaptation of the popular Framework for Reconstructing Epidemiological Dynamics (FRED), a free resource created at Pitt. By visiting fred.publichealth.pitt.edu/measles, people can select cities in which they’re interested and watch short animations that play out an outbreak with either high or low vaccination coverage.

“FRED users can see on a map of any major metropolitan area in the U.S. how one case of measles can turn into a major outbreak or be quickly quashed, all depending on the vaccination rates of a community,” said Donald S. Burke, M.D., Pitt Public Health dean and UPMC-Jonas Salk Chair of Global Health. “Our hope is that people will use this to have informed discussions about the value of vaccination and its role in preventing epidemics.”

Examining the impact of high and low vaccination rates allows people to grasp the concept of herd immunity, explained Dr. Burke. The Centers for Disease Control and Prevention (CDC) estimates that when 95 percent of a community — or the “herd” — is vaccinated against measles, the five percent who can’t be vaccinated because they are too young or have compromised immune systems, as well as those whose immunity wore off or never took hold, should be protected because the virus can’t gain a foothold and spread. When vaccination rates dip too low, the herd isn’t protected and measles can sweep through a community.

Measles is a highly contagious virus. If someone with measles is in a room, nine out of 10 unvaccinated people in that room will contract the virus. For two hours after the infected person leaves, the room’s air will harbor the virus.

The measles, mumps, rubella (MMR) vaccine is recommended for children between 12 and 15 months of age, with a booster usually given between four and six years of age. Older children and adults who missed the vaccine or aren’t sure if they received it can get immunized by their doctor or at a vaccination clinic.

Future iterations of FRED Measles will allow users to adjust vaccination rates and experiment with how closing schools could affect an outbreak.

“Teachers could use FRED to help their students get a hands-on look at how public health interventions impact an infectious disease outbreak,” said FRED creator John Grefenstette, Ph.D., professor of health policy and management at Pitt Public Health. “It’s also something that pediatricians could use to open a dialogue with parents who may not want to vaccinate their children. Public health officials and policy makers could use it to explain vaccination campaigns. There really are a lot of possibilities.”

FRED was created at Pitt’s Models of Infectious Disease Agent Study (MIDAS) Center of Excellence, which is supported by the NIH’s National Institute of General Medical Sciences. MIDAS investigates novel computational and mathematical models of existing and emerging infectious diseases to guide intervention strategies.

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