TABLE 1.

Epidemiologic data of vaccine immunogen-deficient clinical isolates

Isolate	Phenotypec	Yr	State	Age of child	Vaccination status	Symptoms	Hospitalized
J014a	Prn-def, Fha-def	2013	Minnesota	<2 mo	Too young for vaccination	Paroxysmal cough, whooping cough, apnea, cyanosis	Yes
J199a	Prn-def, Fha-def	2014	Colorado	4 yrs	Parental refusal	Paroxysmal cough, posttussive vomiting, apnea	No
J365	Prn-def, Pt-defb	2014	California	<2 mo	Allegedly vaccinated	Paroxysmal cough	No

^aIsolates collected through Enhanced Pertussis Surveillance (61).

^bIdentified in reference 34.

^cPrn-def, Prn deficient; Fha-def, Fha deficient; Pt-def, Pt deficient.