Any substance that can cause a rise in body temperature.
                                                            
                                                     
                        
                                                
                        
                        
                            A substance that induces a febrile reaction in a patient.
                                                            
                                                     
                        
                                                
                        
                        
                            Any substance capable of producing fever in mammals. They are usually a substance shed by bacteria during cell growth. They have a rather stable form and are not easily destroyed by boiling etc.
                                                            
                                                     
                        
                                                
                        
                        
                            A category of substances, including bacterial endotoxins, which may cause a fever when injected or infused.