Any trained person or school nurse, who, in good faith and without expectation of compensation from the person aided or treated, renders emergency care or treatment in response to an apparent allergic reaction by the use of an emergency medication shall not be liable for damages for injuries alleged to have been sustained by the aided or treated person or for damages for the death of the aided or treated person alleged to have occurred by reason of an act or omission in the rendering of such emergency care or treatment, unless it is established that such injuries or such death were caused wilfully, wantonly or by gross negligence on the part of the trained person or school nurse who rendered the emergency care or treatment by the use of an emergency medication.