Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Dec 28:1–26. doi: 10.1080/08830185.2021.2019727

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2021 Taylor & Francis Group, LLC

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

PMC Copyright notice

Figure 2. — Potential risk factors for SARS-CoV-2 reinfection. In a healthy population exposed to SARS-CoV-2, many individuals develop COVID-19 symptoms with different levels of disease severity. Three primary testing strategies namely RT-PCR, Rapid Antigen Testing and Immunoglobulin (Ig) ELISA differing in specificity, sensitivity and speed of testing are the preferred methods for diagnosing SARS-CoV-2 infection. Infected individuals with mild severity usually recover within 7-10 days but viral persistence may last for a longer duration. Waning immunity post infection, evolution of novel genetic variants and old age are some of the major risk factors for SARS-CoV-2 reinfection.