Aim of the study is to find the prevalence of thrombophilic gene methylene tetrahydrofolate reductase (MTHFR) gene polymorphism in a sample of COVID-19 patients, aiming at early detection of MTHFR mutant patients and guiding preventive therapy.

The inflammatory component of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) creates a prothrombotic state that necessitates a thrombophylactic strategy for hospitalized patients. Such strategies are difficult to be standardized because certain individuals can have prothrombotic conditions, such as inherited thrombophilia, which predispose them to an additional coagulative risk. Whether outside the hospital or when admitted, patients with inherited thrombophilia need special anticoagulant attention. Identifying such patients, especially in susceptible populations like the Egyptian people, will aid primary providers in risk stratification for choosing the optimal anticoagulation plan. Case-control study which will be conducted on 33 patients who had been diagnosed as COVID-19 at Ain-Shams University isolation Hospitals and 13 healthy controls. Patients will be subjected to: Thorough history taking, Thorough clinical assessment,COVID-19 PCR+/- radiological data collection, Assessment of MTHFR C677T genotypes were determined by RT- PCR of 2 ml EDTA blood sample, Follow up patient for 28 days as regard development of vascular thrombotic manifestation (D. dimer, LL duplex, or CT chest with Pulmonary angiography if needed).

Inclusion Criteria:

• All adult patients diagnosed as COVID -19 by RT-PCR will be included

Exclusion Criteria:

• Patients younger than 18 years old Patients on Antithrombotic treatment before COVID-19.

Patients diagnosed as COVID -19 by RT-PCR

All IPD that underlie results in a publication maybe shared

3 months after publication

Through the primary investigator e-mail to other interested researchers