top of page
Writer's pictureOssi Mokryn

A new paper in PLoS ONE: A statistical model for early estimation of the prevalence of a disease

Abstract Epidemics and pandemics require an early estimate of the cumulative infection prevalence, sometimes referred to as the infection "Iceberg," whose tip are the known cases. Accurate early estimates support better disease monitoring, more accurate estimation of infection fatality rate, and an assessment of the risks from asymptomatic individuals. We find the Pivot group, the population sub-group with the highest probability of being detected and confirmed as positively infected. We differentiate infection susceptibility, assumed to be almost uniform across all population sub-groups at this early stage, from the probability of being confirmed positive. The latter is often related to the likelihood of developing symptoms and complications, which differs between sub-groups (e.g., by age, in the case of the COVID-19 pandemic). A key assumption in our method is the almost-random subgroup infection assumption: The risk of initial infection is either almost uniform across all population sub-groups or not higher in the Pivot sub-group. We then present an algorithm that, using the lift value of the pivot sub-group, finds a lower bound for the cumulative infection prevalence in the population, that is, gives a lower bound on the size of the entire infection "Iceberg." We demonstrate our method by applying it to the case of the COVID-19 pandemic. We use UK and Spain serological surveys of COVID-19 in its first year to demonstrate that the data are consistent with our key assumption, at least for the chosen pivot sub-group. Overall, we applied our methods to nine countries or large regions whose data, mainly during the early COVID-19 pandemic phase, were available: Spain, the UK at two different time points, New York State, New York City, Italy, Norway, Sweden, Belgium, and Israel. We established an estimate of the lower bound of the cumulative infection prevalence for each of them. We have also computed the corresponding upper bounds on the infection fatality rates in each country or region. Using our methodology, we have demonstrated that estimating a lower bound for an epidemic’s infection prevalence at its early phase is feasible and that the assumptions underlying that estimate are valid. Our methodology is especially helpful when serological data are not yet available to gain an initial assessment on the prevalence scale, and more so for pandemics with an asymptomatic transmission, as is the case with Covid-19.

51 views7 comments

7 Comments


Soniya Singhania
Soniya Singhania
Sep 25

The time and money spent on Goa Escort will be well worth it. They will start making you feel comfortable with romantic gestures when you first meet them.

Like

Neha Dutt
Neha Dutt
Sep 25

So here you are getting the best cheapest profile through Goa Call Girls service, in the range of selection of various types of escorts companionship this website is perfect for you to pick one of the desired call girls, here you are watching multiple selections on this page, it is completely enjoyable for you.

Like

Neha Dutt
Neha Dutt
Sep 25

Goa is a very beautiful place in India, people come every year for their enjoyment and enjoyment, they want to have fun with Goa Escorts Service girl This is why they seek a variety of avenues for fun.

Like

Morse Norman
Morse Norman
Sep 24

In geometry dash, players guide a square-shaped figure through a difficult level sequence filled with obstacles, jumps, and traps.

Like

dung do
dung do
Sep 18

Wonderful article. This blog is impressive, and I’ve been checking it frequently.Thank you for sharing your info. I really appreciate your efforts and I am waiting for your further post thank you once again. moto x3m

Like
bottom of page