In this article mortality rate ( 1) due to pulmonary fibrosis ( 2,3 )associated with SARS-COV-2 ( 4,5 ) is analysed at the early stage of Covid19 infection globally with effect from 21St January to 28th April, 2020 ( 6 ).Pulmonary fibrosis may be considered as one of the major cause of death due to severe acute respiratory syndrome ( SARS-COV-2 )(5) infection . The mortality percentage data(5) within a total ninety eight days are analysed by best fit regression(7) like Polynomial – Morgan Morgan Finney ( MMF ) (7, 8,9 )- Harris model are analysed in detail to compare the scope of best fit with two prime epidemiological parameters like mortality percentage (6) vs duration in days with regular interval of seven days . The entire statistical analysis is computationally analysed by a standard coding of data analysis (11).