Terry - Somerset":2gtmujkn said:
We don't know:
- the real mortality rate (although the govt may have reasonable estimates)
- if Germany are managing better or storing up problems for a second wave
- if a vaccine is possible - or is the govt wary of creating expectations
- when lockdown will be relaxed - but govt probably have a very good idea through modelling
- current deaths in care homes and at home
- the reality behind PPE shortages - is current demand 10% up or 10 times normal
It is much too early and pointless to find culprits, we should try and get answers to the basic questions first.
Perhaps I can attempt to answer your questions as follows:
The 'real' mortality rate is an impossible figure to calculate, as everyone estimates it differently. To get a definitive answer you would infect a known number of people, monitor them, and then calculate the death %. We cannot do this as we do not know who is infected, we do not test everybody, we do not know who is asymptomatic and we do not know whether people are dying of covid-19 or with covid-19. We are also recording death statistics differently depending on which country you are in, and with significant delays in some instances. In the UK we take hospital data daily, care home data weekly and do not test corpses. Other countries have different methodologies. Death rates vary not only by country, but also by population characteristics. The current focus in BAME cohorts is largely due to a higher prevalence of underlying co-morbidities and a tendency to live in larger family groups, as well as social factors such as tending to be in lower paying jobs and needing to work rather than being able to afford to self isolate.
Germany have a massively increased testing rate compared to most other countries, as well as a population who are happy to follow rules and do as they are advised. As soon as you test someone as positive, they can be told to isolate (and will do so) such that spread of infection is minimised. This, more than anything else, reduces the death rate simply because fewer vulnerable elderly people are exposed to the virus. Social distancing is not designed to reduce individual risk, it is designed to stop spread and the prevent the critical care system being overwhelmed. The only risk for the future is mixing while the virus is still active - this will lead to repeated waves of infection needing the same distancing response as currently. Public appetite for repeated rounds of this will vary still (look at the US and protests already over lockdown) and infection rates will track the distancing efforts.
It is too early to say whether a vaccine will be effective or not. It largely depends on how fast the spike proteins on the coat of the virus mutate. Testing is much easier than vaccination. There is more than one way to create a vaccine, but only one way to test them all - you vaccinate then infect people and study the length and duration of any response. When you have no other treatment, you have to do this very carefully. You either vaccinate lots of people and then study that population and track those who become infected naturally, or you vaccinate a smaller cohort and then deliberately infect them. This is ethically challenging given the lack of alternative treatment options, and there is no point testing a vaccine on fit 25 year olds then rolling it out to the general population. You also need to follow people for a period of time after infection, and multiple rounds of infection, to determine how long a vaccine lasts. We are already dropping the need for animal testing and going to clinical trials, but that has risks of its own. Look up thalidomide if you want a recent example of what can go wrong when people don't think of the right questions to ask before a trial.
Depends what you mean by lockdown - being at home with all but essential things open is as much an economic/political decision as a health one. Social distancing on the other hand is possible for a prolonged period without full lockdown. There are a number of relaxation scenario's, with varying degrees of risk. Too far too soon and infection rates rise again and you are back to square one - repeated waves of lockdown. Large gatherings are unlikely to be soon (football matches, concerts etc) but you could see offices and workplaces being open sooner. It will largely depend on the infection, hospitalisation and death rates dropping significantly over the next 3 weeks as to whether a further 3 week lockdown is necessary. The data suggests the rates are dropping, but when the sweet point is to relax current restrictions is not a defined point.
Unless you test extensively, you will not know this. Testing is a 'point in time' determination and does not help much - the main advantage of testing is to get 'healthy' key workers back to work rather than self isolating for 14 days due to a cold. To get a handle on care home deaths you would need to test everyone regularly, particularly post mortem.
PPE is like any other commodity. Suppliers do not make more than they are expecting to sell, otherwise they have materials and stock they have to store. Similarly end point consumers do not buy more than they expect to need or they have to store it and tie up money that can be used for other things - there is not tons of spare cash in the NHS for this type of 'just in case' planning. Yes, it is worrying that there is a PPE shortage, but you cannot just phone up a supplier and gain an extra 10 million disposable gowns with 7 days notice - particularly in a worldwide shortage. Government cannot magic it up - it takes time for supply to meet demand. It would be helpful if some journalists took this on board rather than just writing 'disgusting lack of foresight' articles. On top of the NHS, we have tube drivers, bus drivers, police, firefighters, care homes and others all suggesting their staff should have access to PPE too - where they imagine it is currently sitting waiting to be distributed I am not sure. Perhaps one advantage of this situation is that we will move some of our manufacturing base back to the UK, or we will have a disaster/pandemic plan going forwards for the next unforseen situation - how far do you plan though and how much money do you invest in a 'what if' plan - PPE has a shelf life, so do drugs, ventilators and pretty much every other commodity currently in demand.
I am not an expert, but I am a scientist, I am involved in the covid-19 response and I do have an understanding of vaccines, virology and healthcare from my job. The above is simply my take on each of the questions you have posed - albeit brief answers.
Steve