Toxicity study of SARS-CoV-2 Spike protein expressed on Bacillus subtilis spores. - Hazan, Atiqah; Saperi, Amalia A.; Zulkifli, Nurfatihah; Rahim, Nor-Aziyah Mat; Tiong, Vunjia; Lee, Hai Yen; AbuBakar, Sazaly (BMC Microbiology, 2025)