In this paper, a metal strip loaded doping less TFET (MS-DLTFET) biomarker with four cavities is proposed for SARs-CoV-2 detection virus. The results demonstrate that the proposed device offers an improved biomarker performance by introducing the charged plasma concept and the metal strips. The electrical parameters such as electron tunneling rate, drain current (Ids), current ratio (ION/IOFF), threshold voltage (Vth) are evaluated through simulations by immobilized dielectric constant (k) and charge density (ρ) of the bioelements in the nano-gap cavities. In addition, their sensitivity is also calculated with respect to air. The results depict that the proposed device tenders better performance in terms of Ids, ION/IOFF and Vth sensitivity as compared to existing devices. The device's response time under varying k and ρ values are investigated. The non-uniform cavity configurations formed due to steric hindrance effect are studied. It is found that concave configuration offers the best performance compared to other. Furthermore, the cavity size analysis is also performed to optimize the device performance.