Umno president Ahmad Zahid Hamidi has questioned the progress of the Covid-19 vaccination exercise, which he claimed was slow.br br Zahid has also claimed alternative efforts to bring in approved Covid-19 vaccines are being stalled.br br "Two months have passed and the vaccination process is slow. Where did it go wrong?br br "To date, 451,237 individuals have completed the two-dose vaccination regime and that too only involved selected persons.