Any new on/off label treatments for 65 y.o. with prolonged apparent b. pertussis. i.e.cough and malaise x 4 mos? contagious? thanks again.

See CDC recommendati: Antibiotic treatment later in the course of disease probably does not affect the course of symptoms, but may be useful to reduce the spread of the infection. In general, antibiotic therapy is warranted for patients with duration of symptoms ≤2 weeks; it may also be given for patients with persistent symptoms for up to four weeks.