Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is causing devastation worldwide accounting millions of deaths. This virus is among the new member of the Coronaviridae family with differences from SARS-CoV. The entry of the virus to human cells mediated through spike (S) proteins with angiotensin-converting enzyme 2 (ACE2). Several comorbidities such as hypertension, diabetes, HIV, malignancy, diabetes, chronic respiratory disease, and cardiovascular disease makes a person susceptible to COVID-19 infection. Circadian rhythm/oscillations or biological clock plays important role in the pathogenesis of SARS-CoV-2 infection mediated through ACE2 and BMAL1.

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This study aimed to assess the isolation of novel coronavirus in tears and conjunctival secretions by reverse transcriptase polymerase chain reaction (RT-PCR) assay from novel coronavirus disease 2019 (COVID-19) patients presenting with keratoconjunctivitis.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) is severely affecting the worldwide population. It belongs to the coronavirus family which exhibit protein constituted enveloped single-stranded RNA. These viral proteins undergo post-translational modifications (PTMs) that reorganized covalent bonds and modify the polypeptides and in turn modulate the protein functions. Being viral machinery, it uses host cells system to replicate itself and make their copes, their proteins are also subject to PTMs. Glycosylation, palmitoylation of the spike and envelope proteins, phosphorylation, of the nucleocapsid protein are among the major PTMs responsible for the pathogenesis of the viral infection phase. The current knowledge of CoV proteins PTMs is limited and need to be exploring for to understand the viral pathogenesis mechanism and PTMs effect of infection phase.