Introduction: Coronavirus disease 2019 (COVID-19) is a pandemic disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The disease was first identified in December 2019 in Wuhan and spread in 216 countries due to airborne transmission. But the transmission rate is low in some of the countries and large in a few countries like Italy Iran, Japan, India, the USA etc. Objective: The present paper focuses on the study of the transmission speed of COVID-19 cases. But it is observed that up to 5th march the total daily number of cases conformed is below 1000 from various countries where it is now raised to more than 75,000. Methods: 14 countries case studies are taken depend on the data availability, the first case reported in the last week of January or the first week of February and the severity of the outbreak of COVID-19. The daily reported number of Covid-19 cases for each country is collected from the WHO Daily reports. The data is converted into a graphical form. The selected countries are divided into three groups. The first group contain the cases reported below 10,000 on 16th April 2020, the second group reported the cases between 10,000 to 50000 on or before 16th April and the third group reported above 50,000 cases on 16th April 2020. Results: Sudden rise in cases take place from 12th March 2020 to date over the entire globe. From the available data, it is also observed that the number of countries infected also drastically increased in March 2020. Conclusion: It is also observed that in nearly the first 40-50 days the transmission rate of coronavirus is very low and confirmed cases reporting have travel history. After that, the local transmission took place which led to the sudden rise in confirmed cases.