The two independent medical researchers said in interviews yesterday that Merck might have been premature in reaching the conclusion announced Thursday, in part because the patients in the study needed to be monitored for longer than one year.
Patients in the paediatric age group will not be included because the study needs invasive procedure (acute and convalescent venous blood sampling) with follow-up which will be difficult for children as well as for parents.
That's great news, but it will make it harder to show that a vaccine works, because the studies need a minimum number of new infections to prove that it offers protection from the disease.
This is even more so in patients receiving palliative care because the observational studies needed are methodologically challenging for several reasons.
In other words, the systematic recording of masses of data alone won't be enough to ensure the reproducibility and objectivity of social studies, because these studies need to use often controversial social concepts to make their data significant.
Unfortunately, it's very difficult to get a definitive answer, because the study that needs to be done – randomly assigning groups of pregnant women to consume varying amounts of alcohol and then watching to see what happens to their babies as they grow up – would be unethical.
According to Freedman, the Helsinki model is preferred, as he sees no advantage in judging value prior to a risk-benefit analysis, especially because the value of a study needs to be judged "within the context of all other elements of the ethics of research" [ 1].
Because ASDs are not common, the study will need large numbers of children to have enough statistical power, according to Susser.
The factors that govern infection and progression to active disease are not well understood, largely because the tools needed to study these phenomena are limited.
Existing relationships and loyalty play an important part in shaping practice, and were valued in the current study because the commissioners needed the knowledge (clinical and practical/operational) of providers in order to support them in their commissioning role.
