The Public Health Consequences of an Inaccurate Census

These are our neighbors, families, and friends. But let’s be clear: the impacts would extend beyond those communities, especially the public health consequences. As the Chicago meningococcal outbreak illustrates, health officials need a complete picture to protect people from disease and other threats. They must know who is getting sick, where, and at what rate. Take any of those data out of the equation, and the people who need the most help are far less likely to get it.  

During the H1N1 influenza pandemic in 2009, when one of us, Dr. Richard Besser, served as acting director of the Centers for Disease Control and Prevention (CDC), census data were instrumental in tracking the outbreak. CDC relied on this data to calculate infection rates by age, which showed that children and young adults were getting sick at far higher rates than older adults—a striking departure from typical patterns observed with seasonal flu. When a vaccine became available, these data directly informed recommendations that prioritized children and young adults.