TNF and juvenile idiopathic arthritis: However,pneumococcal vaccination resulted in one mild local AEFI, redness andswelling at the injection site, in a child with JIA.38 Moreover, one serious AEFI, an IPD with bacterial pneumonia 5 monthspost-vaccination, was reported in a child with JIA on anti-TNF treatment whoseroconverted to six out of the seven serotypes analysed.38 Disease parameters remained stable in patients with JIA, with noreported disease flares among participants.38