Virus or bad reaction to baby food?

Hello everyone, our seven month old baby ate chicken and tomatoes baby jar food tonight. It's the first time he's had tomatoes and he has bad reflux. He started spitting it up, then sort of throwing up/spitting up and about 30 minutes ago just totally projectile vomited everything up. Is this a bad reaction to the food, or is this a virus? No fever and is acting normal - just throwing up. In either case, what do I do?