We have all seen the ‘flatten the curve’ model by now. The model shows the capacity to support sick people as a horizontal line. (I’ll call it the capacity curve.) I propose that line shouldn’t be horizontal but instead a complex curve shaped more like a check mark.
I believe the capacity curve is a function of four main inputs: healthcare workers, consumable material, non-consumable material and logistics.
First, healthcare workers. Initially the healthcare workers will have the same immunity as the general population. None. But as they will be constantly exposed to the virus day after day they will get infected far faster than the general population. In the beginning this will cause many to become sick and have to go into isolation. When a part of healthcare workers go into isolation the capacity to treat the sick will decrease.
The good news is the rather small population of healthcare workers will quickly develop community herd immunity. As that happens their illnesses will decrease and their capacity to treat the sick will return to almost full capacity.
Second, consumable material. This is things like PPE (masks, gloves, disinfectants…) and medications. Initially there will be enough consumables. Eventually the consumables will be used and a shortage will develop. This shortage will increase infections among healthcare workers and reduce treatments to patients. This will reduce the capacity curve.
The good news is that production will have been increasing. Eventually production will outpace use and the capacity to treat the sick, for its input, will go back to full.
Third, non-consumable material. This consists of everything from respirators and ventilators to hospital beds. This is a bright spot. We start with a certain number of non-consumables. They do not get consumed or compromised. As things like respirators are newly made they go into the system which increases capacity. As empty hotels are converted into emergency hospitals the number of beds will increase. Over time the capacity to treat the sick only increases.
Finally, logistics. You could also call it experience or efficiency. It’s all those things. It’s a factory figuring out how to make masks faster, or how to deliver those masks to where they need to be sooner. It’s knowing when to best start and stop treatment of a patient to minimize resource use and maximize survivability. Like non-consumables the capacity input only improves.
So we have a capacity curve with four inputs. Two inputs decrease initially - severely - and then return to full or almost full. Two other inputs start at a given level then increase over time. Put that together and you have a check mark shaped capacity curve.