The twenty-first century has witnessed some of the deadliest viral pandemics with far-reaching consequences. These include the Human Immunodeficiency Virus (HIV) (1981), Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) (2002), Influenza A virus subtype H1N1 (A/H1N1) (2009), Middle East Respiratory Syndrome Coronavirus (MERS-CoV) (2012) and Ebola virus (2013) and the Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) (2019-present). Age- and gender-based characterizations suggest that SARS-CoV-2 resembles SARS-CoV and MERS-CoV with regard tohigher fatality rates in males, and in the older population with comorbidities. The invasion-mechanism of SARS-CoV-2 and SARS-CoV, involves binding of its spike protein with angiotensin-converting enzyme 2 (ACE2) receptors; MERS-CoV utilizes dipeptidyl peptidase 4 (DPP4), whereas H1N1 influenza is equipped with hemagglutinin protein. The viral infections-mediated immunomodulation, and progressive inflammatory state may affect the functions of several other organs. Although no effective commercial vaccine is available for any of the viruses, those against SARS-CoV-2 are being developed at an unprecedented speed. Until now, only Pfizer/BioNTech's vaccine has received temporary authorization from the UK Medicines and Healthcare products Regulatory Agency. Given the frequent emergence of viral pandemics in the 21st century, proper understanding of their characteristics and modes of action are essential to address the immediate and long-term health consequences.

Department of Animal Morphology Physiology and Genetics Faculty of AgriSciences Mendel University in Brno Zemedelska 1 613 00 Brno Czech Republic

Department of Life Science and Bioinformatics Assam University Silchar 788011 India

Department of Microbiology R G Kar Medical College and Hospital Kolkata 700004 India

Department of Obstetrics and Gynecology Silchar Medical College and Hospital Silchar 788014 India

Department of Oral Biology and Biomedical Sciences Faculty of Dentistry MAHSA University SP2 Bandar Saujana Putra Jenjarom Selangor 42610 Malaysia

Department of Pathology Silchar Medical College and Hospital Silchar 788014 India

Department of Physiology Faculty of Medicine and Biomedical Sciences MAHSA University SP2 Bandar Saujana Putra Jenjarom Selangor 42610 Malaysia

Health Centre Assam University Silchar 788011 India

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