Table 1.

List of primer sets.

Target gene	Primer name	Primer sequence (5’-3’)
N	N WT 31-33 forward	GTAACCAGAATGGAGAACGCA
N	N del 31-33 forward	ACTGGCAGTAACCAGAATGGTG
N	N reverse	CGGTAGTAGCCAATTTGGTCATC
S	Spike WT 143-145 forward	ATGATCCATTTTTGGGTGTTTATT
S	Spike del 143-145 forward	GTAATGATCCATTTTTGGACCA
S	Spike reverse	ACACAAATTCCCTAAGATTTTTGA
S	Spike control forward	CAACAAAAGTTGGATGGAAAGTG
S	Spike control reverse	GATCACGCACTAAATTAATAGGC

Deleted nucleotides are in bold.