there are lots of different types of white blood cells, all playing different roles so next story amos dominico count how many you have of each key type. it could separate many of them off for more tests. incredibly each blog here is a droplet of salty water with one cell inside. 260 adam brooks patients and staff are giving this blood for their research, some got very sick and some did not. the key question for scientists, can you see the difference in their blood? we have found a number of patients with advanced covid—i9 disease and some of those point to potential therapeutics that could impact the disease but we are hoping when people develop symptoms and they get the first tests when tests become more readily available at that point they might be able to predict how that micah goes on to get severe disease. by understanding the science of the disease, it is easier to find drugs to fight it. that is that for now and you can follow me on twitter or head to the bbc news site for the latest information. thank you so much for watching. hello there, the month of may was consistently sunny right