*Update in post # 12*
Just got an email to say that a kid (let's call her Grace, not her real name) we were around for 2 consecutive days last weekend (about an hour each time) *may* have pertussis. She had an awful cough and I was wishing her mom hadn't brought her to the parties we were at. Her 9 yr old sister has a confirmed case of pertussis, so it's possible the 5 year old kid or her mom (both of whom were at these bday parties) may develop it. All three are vaccinated, including the kid who has pertussis (who we have never met).
Both my DDs attended the parties, neither got too close to Grace, both are up to date on vaccines. DD2 is 5 and had her last shot just 7 or 8 months ago at her 5 year check-up. DD1 is almost 10, so it's been 5 years since her last booster. I got mine after DD2's birth, so in 2010.
Should we be worried?