KUALA LUMPUR, Dec 31 — The Yang di-Pertuan Agong, Al-Sultan Abdullah Ri'ayatuddin Al-Mustafa Billah Shah, and the Raja Permaisuri Agong, Tunku Hajah Azizah Aminah Maimunah Iskandariah, have expressed their hope that the arrival of Covid-19 vaccine can flatten the pandemic curve and break the virus transmission in Malaysia.