Hi, Your husband seems to have had some infection of his gastrointestinal tract which can be managed with a course of an antibiotic and antiprotozoal drugs like Norfloxacin and Metronidazole respectively under the prescription of your treating physician. You may try some antispasmodics like Buscopan for his colicky pain which may be available over the counter. Please give him lots of fluid to avoid dehydration. Its not necessary that same food should cause infection in everyone who eats it as the level of immunity may vary from individual to individual. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Anoop Kumar, General & Family Physician