Whooping cough on the rise, OK to vaccinate but avoid Pentacel

Pertussis infections have reached epidemic proportions in the state of Washington, officials there said, with more than 10 times as many cases this year as were counted by early May in 2011.

The state's health department has recorded 1,284 cases of pertussis, familiarly known as whooping cough, through May 5. Last year, 128 cases were reported through the first 18 weeks.

In six of the past eight weeks, more than 100 cases were reported. Although there were only 54 in the week ending May 5, the health department noted that additional cases may have occurred that had not been reported to the department.

By far, the highest infection rates have been in children and teens. Infants younger than 12 months and children 10 to 13 years old have had rates approaching 1 per 1,000.

Among the 86 infants infected, 23 were hospitalized. Most of those admissions were in infants younger than 3 months.

Diphtheria, Tetanus, and Pertussis Vaccines

There are several formulations of vaccines used to prevent diphtheria, tetanus and pertussis. Some are combined with vaccines to prevent other diseases and reduce the total number of shots that someone receives at one office visit. In the U.S., DTaP, Tdap, and Td vaccines are most commonly used. One of these (DTaP) is given to children younger than 7 years of age, and two (Tdap and Td) are given to older children and adults.

Children should get 5 doses of DTaP, one dose at each of the following ages: 2, 4, 6, and 15-18 months and 4-6 years.

Td is a tetanus-diphtheria vaccine given to adolescents and adults as a booster shot every 10 years, or after an exposure to tetanus under some circumstances. Tdap is similar to Td but also containing protection against pertussis. Adolescents 11-18 years of age (preferably at age 11-12 years) and adults 19 through 64 years of age should receive a single dose of Tdap. For adults 65 and older who have close contact with an infant and have not previously received Tdap, one dose should be received. Tdap should also be given to 7-10 year olds who are not fully immunized against pertussis. Tdap can be given no matter when Td was last received.