variants of concern in the scientific and common spelling with greek letters: alpha, beta, gamma and delta on the signs.

2019 africa african alpha alphabet b117 b1351 b16172 banner beta brazil brazilian britain british concept concern coronavirus cov covid delta design england english epidemic flag gamma graphic great greek handwritten health icon illustration india indian infographik information kingdom letter lineage mutant mutated mutation name national ncov sars sign south spelling stamp stemp symbol table text united variant variation vector virus word scientific common who new old