European experts this Wednesday warned poultry and eggs should be cooked thoroughly to avoid any risk of catching bird flu, which has killed 60 people worldwide since 2003. The advice was issued following reported public anxiety about the safety of poultry products.
The FSA has responsibility for allaying fears over the consumption of products from an industry worth £10bn in Europe.
Martinson quit after five years to set up his own, yet-to-be-named agency.
He joined the FSA shortly after it was set up in 2000 in the wake of the BSE crisis. He grew the agency's nine-strong communications team to its current size of 44 staff.
Head of media relations Karen Talbot is temporarily acting in Martinson's role.