COVID Testing Definition Was Not Changed to Find Millions of New Omicron Cases

Social media users are sharing an online article claiming that the "definition of what constitutes a positive test" has changed, implying that "millions of new 'COVID' cases will be discovered." 

 The article goes on to state that, according to the World Health Organization (WHO), there is an "S gene target failure" – in other words, the current PCR kits will not detect this sequence and may only detect one or two of the other selected sequences."