JAKARTA – In October, Indonesian diplomats and Muslim clerics stepped off a plane in China. While the diplomats were there to finalize deals to ensure millions of doses reached Indonesian citizens, the clerics had a much different concern: Whether the COVID-19 vaccine was permissible for use under Islamic law.As companies race to develop a COVID-19 vaccine and countries scramble to secure doses, questions about the use of pork products — banned by some religious groups — has raised concerns about the possibility of disrupted immunization campaigns.Pork-derived gelatin has been widely used as a stabilizer to ensure vaccines remain safe and effective during storage and transport.