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Pertussis Facts (from the New York State Health Department)
Updated: January 2012
What is pertussis?
Pertussis, or whooping cough, is a highly contagious bacterial infection that
causes an uncontrollable, violent cough lasting several weeks or even months, It is caused by a
bacterium that is found in the mouth, nose and throat of an infected person. Pertussis may
begin with cold-like symptoms or a dry cough that progress to episodes of severe coughing.
Who gets pertussis?
Pertussis can occur at any age. Children who are too young to be fully
vaccinated and those who have not yet completed the primary vaccination series are at highest
risk for severe illness. Since the 1980s, the number of reported pertussis cases has gradually
increased in the United States. In 2005, over 25,000 cases of pertussis cases were reported in
the United States, the highest number of reported cases since 1959. Approximately 60% of the
cases were in adolescents and adults and may be a result of decreasing immunity in this
How is pertussis spread?
Pertussis is primarily spread from person to person by direct contact
with mucus or droplets from the nose and throat of infected individuals. Frequently, older
siblings who may be harboring the bacteria in their nose and throat can bring the disease home
What are the symptoms of pertussis?
Pertussis begins as a mild upper respiratory infection.
Initially, symptoms resemble those of a common cold, including sneezing, runny nose, low-
grade fever and a mild cough. Within two weeks, the cough becomes more severe and is
characterized by episodes of numerous rapid coughs fol owed by a crowing or high pitched
whoop. A thick, clear mucous may be discharged from the nose. These episodes may recur for 1
to 2 months, and are more frequent at night. Older people or partial y immunized children
How soon after infection do symptoms appear?
The incubation period is usually 7 to 10 days
with a range of 4 to 21 days and rarely may be as long as 42 days.
When and for how long is a person able to spread pertussis?
If untreated, a person can
transmit pertussis from onset of symptoms to 3 weeks after the onset of coughing episodes.
The period of communicability is reduced to 5 days after treatment with antibiotics.
What are the complications associated with pertussis?
Major complications of pertussis are
more common among infants and young children and may include pneumonia, middle ear
infection, loss of appetite, sleep disturbance, syncope (temporary loss of consciousness),
dehydration, seizures, encephalopathy (a disorder of the brain), apneic episodes (brief delay in
What is the treatment for pertussis?
The recommended antibiotics for the treatment and
postexposure prevention of pertussis include azithromycin (Zithromax), erythromycin and
clarithromycin (Biaxin). Alternately, trimethoprim-sulfamethoxazole (Bactrim) can be used.
Does past infection with pertussis make a person immune?
Neither vaccination nor natural
infection with pertussis guarantees lifelong protective immunity against pertussis. Since
immunity decreases after 5-10 years from the last pertussis vaccine dose, older children,
adolescents and adults are at risk of becoming infected with pertussis and need vaccination.
What is the vaccine for pertussis?
Infants and Children:
The childhood vaccine for pertussis is usually given in combination with
diphtheria and tetanus. Immunization authorities recommend that DTaP (diphtheria, tetanus,
acellular pertussis) vaccine be given at 2, 4, and 6 and 15-18 months of age and between 4 and
Pre-teens and Adolescents:
In 2005, a new vaccine was approved as a single booster
vaccination for adolescents and adults cal ed Tdap (tetanus, diphtheria, and acellular pertussis).
The preferred age for routine vaccination with Tdap is 11 or 12 years old. Adolescents, aged 11
through 18 should receive a single dose of Tdap instead of Td (tetanus, diphtheria) for booster
immunization against tetanus, diphtheria, and pertussis if they have completed the
recommended childhood DTP/DTaP vaccination series.
A single dose of Tdap vaccine is also recommended for children aged 7 through 10 years who
are not fully vaccinated against pertussis.
All adults over 19 years of age who have or who anticipate having close contact with an
infant should receive a single dose of Tdap to protect against pertussis and reduce the
likelihood of transmission. For other adults aged 65 years and older, a single dose of Tdap
vaccine may be given instead of Td vaccine in persons who have not previously received Tdap.
Tdap can be administered regardless of interval since the last Td vaccine.
Healthcare personnel, regardless of age, should receive a single dose of Tdap if they have not
previously received Tdap and regardless of the time since their most recent Td vaccination.In
New York State, pertussis vaccine is required of all children born after 1/1/2005 who will be
enrolled in pre-kindergarten programs and schools. Tdap vaccine is required for children born
on or after 1/1/1994 and enrolling in 6th through 10th grades.
What can be done to prevent the spread of pertussis
? The single most effective control
measure is maintaining the highest possible level of immunization in the community. Treatment
with appropriate antibiotics, such as Zithromax, will shorten the time a person can spread
pertussis to 5 days after the beginning of treatment.
People who have or may have pertussis should stay away from young children and infants until
properly treated. Treatment of people who are close contacts of pertussis cases is also an
What is parapertussis?
Parapertussis is a bacterial illness that is similar to pertussis (whooping
cough) but is not as common and generally causes less severe symptoms. Up to 40°h of all cases
of parapertussis will present with no symptoms. Very young infants (<6 months of age) may
have a more severe course of parapertussis than older persons. Parapertussis is spread through
the air in droplets produced during coughing and sneezing. A person can be infected with
parapertussis and pertussis at the same time. Parapertussis can be distinguished from pertussis
by certain laboratory tests. Antibiotic treatment should be started as soon as parapertussis is
suspected. Al infants less than 6 months of age should receive antibiotics as a preventive
measure if they have been in contact with a person who has parapertussis.
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CURRICULAM VITAE S. SYED JAHAN , 8/149 – Middle Street MANDAPAM – 623 518 Educational Qualification • Pursuing M. Sc., Zoology, Annamalai University Annamalai Nagar, • B. Sc., Zoology, Jamal Mohammed College Bharathidasan University Technical and other qualification • Typewriting junior grade 1990, Department of Technical Education, Tamil Nadu • Typewriting s