so far doctors have tried dogs that have already been used for other viral diseases like a chevy impala, sars and influenza. sometimes they can help, but they are not. the breakthrough medical experts are hoping for. ready what we do know is that how well a drug works depends above all on when it is administered. in the early stage, when the virus enters the body and multiplies or a later face and body reacts with inflammation and immune defense. problematic because if you have a patient, you don't really know what to do and everybody tries to this and they observe the patient and it helps off the symptoms. but there is no stem that recommendation so far. hospitals around the world are gaining experience with covert 19 and gathering data, and the hope that it will soon be possible to do more than just protect healthy people with a vaccination. hello and welcome tara covert 900 special. i'm chris kolber, berlin vaccination programs around the world are the strongest defense against the spread of the current of ours. but treating patients who have fallen ill has been a lot more challengin