Emergency services say the patients were all stung multiple times.
IPSS Medical Rescue's Paul Herbst says two people had serious reactions to the stings.
"Several of the employees were severely stung multiple times. Two people sustained extensive critical injuries due to anaphylaxis," he said.
Herbst says no one else was hurt.
This South African man went cooking eggs in hotels to being recognised a...Jane Linley-Thomas 4 hours ago
Meeting the parents is a nerve-racking time in any relationship. Thankfu...Jane Linley-Thomas 4 hours ago