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In the current decade, medical facilities are increasing day by day for the betterment of human beings. Medical facilities help human beings prevent and recover from life-threatening diseases (Rajinikanth et al., 2020). Globally, health ailments have been faced with incommunicable and chronic diseases due to various uncontrolled and unavoidable reasons (Chen et al., 2020). Most diseases can be cured through different diagnosis practices if they are identified at their early stage (Krishnan et al., 2010). Diagnosis of the problem can be made through an additional diagnostic method like blood count, CT scan, X-ray, and other tests (Rajpurkar et al., 2017);(Bhandary et al., 2020) to cure or control that disease. But in some scenarios, these tests cannot find the exact problem, and that particular diseases are declared as pandemic diseases. In the different studies, it has been concluded that the lungs are one of the most important organs which help humans to breathe, and infection related to the lungs has an effect on the human body respiratory system, which further leads to death (Syrjala et al., 2017). Tuberculosis, Asthma, Chronic Obstructive Pulmonary Disease, Chronic Wound, Lung Cancer, and many more are some significant diseases (Chakraborty, 2017), affecting the human body, lungs, and respiratory system (Zech et al., 2018). In the current instance, the whole world is dealing with a pandemic disease named COVID-19, which is declared a contagious disease. COVID-19 is declared a pandemic disease by the World Health Organization (WHO) in March 2020 after the different countries' infected and death rate data (Karim et al., 2020). COVID-19 started its journey by reporting cases with unknown cause from the Wuhan city of China on 31st December 2019 and later became pandemic throughout the world (F. Wu et al., 2020);(Huang et al., 2020);(Organization et al., 2020). This virus is from the corona family, which is termed as SARS-COV-2, and disease-related to this virus is named COVID-19 (Z. Wu & McGoogan, 2020). As of October 29, 2020, there have been 43,766,712 confirmed cases of COVID-19, including 1,163,459 deaths (WHO, 2020). The COVID-19 is human to human transmission disease or communicable disease spreading very fast among the community (Tan et al., 2020);(Zhu et al., 2020);(Li et al., 2020). According to different researchers and doctors, it is becoming difficult to control this pandemic as its transmission medium is still theorized (Qiu et al., 2020). Patients of COVID-19 are assumed to be infected through common symptoms like fever, cold, cough, difficulty in breathing (D. Wang et al., 2020). Medical facilities have increased with time, but still, countries and hospitals are frenzied in improving the facilities to accommodate the COVID-19 patients (Karim et al., 2020). The state-of-art test for COVID-19 is the reverse transcriptase-polymerase chain reaction (RT-PCR) test which is tested through specialized kits in particular laboratories (Ozturk et al., 2020).
The detection of the presence of the COVID-19 virus is a time-consuming task as it is done currently in clinical laboratories. The kits used for the tests are giving inaccurate results or taking more than 24 hours to provide the products. The number of cases being tested is enormous, resulting in the delay of test results. This delay proves fatal at times as a crucial period of treatment is lost. Using the available CNN techniques to classify the CT images for the presence or absence of the virus is less time consuming and tedious than the clinical tests.