Outbreaks of whooping cough may be contributed by state laws which allow parents to exempt their child from vaccine due to personal beliefs according to researchers reported// Tuesday.
Investigators found higher rates of whooping cough in such states to the tune of around 50 percent higher than in states which only allowed exemptions for medical reasons and religious beliefs. The researchers have reported their findings in the Journal of the American Medical Association.
Study authors, led by Saad B. Omer of Johns Hopkins University in Baltimore found that in states such as California, parents can take a personal-belief exemption by simply signing a school immunization form. Still other states, like Maryland, officially allow only religious exemptions; but here too parents have only to sign a form, which makes it likely that many take the exemption for personal reasons.
Omer said that the elevated rates of whooping cough in these states point to the "very real consequences" of relaxing vaccination requirements.
Whooping cough, also known as pertusis is a highly contagious bacterial infection of the respiratory system which causes fits of severe coughing and breathing difficulties -- often with a distinctive "whoop" sound on inhalation. Although a person can become infected at any age it is especially dangerous, and potentially fatal, to babies and young children.
Although childhood vaccination with the combined diphtheria, tetanus and pertussis or the DPT vaccine can prevent whooping cough, the rate of infection in the U.S. has been steadily rising in recent years.
According to Dr. Daniel A. Salmon, an associate professor of epidemiology at the University of Florida College of Medicine and the study's senior author this trend is one reason why the current study was undertaken.
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