Sandaruwini, B.A.P.N.; Somathilake, L.W.
(Faculty of Science, University of Ruhuna, Matara, Sri Lanka, 2022-01-19)
Presently, COVID-19 (CoronaVirus-2019) virus attacks the whole world due to its high transmission rate. As a result of the efforts of several countries, many vaccines have been invented at present. Several compartmental ...