Researchers show mathematically how to best reopen your business after lockdown

August 11, 2020

In the USA, where the curve of infections has not yet flattened since the beginning of the pandemic, 158,000 people have died from Covid-19 already. And despite the choice by all US states to gradually ease lockdown from late May onwards to save the economy, 14 million Americans have lost their job, while the economic output in the second quarter of 2020 dropped by 9.5%. To help entrepreneurs decide on how they can safely reopen their business, mathematicians and statisticians here develop a model for the spread of infections within companies and the economic payoff of safety measures. Their findings are published today in Frontiers in Applied Mathematics and Statistics.

"Our aim was to provide a quantitative yet simple modeling tool for business executives to plan for reopening their workplace," says lead author Prof Hongyu Miao, Director of the Center for Biostatistics Collaboration and Data Services at the University of Texas Health Science Center in Houston, Texas.

The authors show mathematically that, under a wide range of parameters, reopening your business will only be feasible if at least these safety measures are adopted: wearing goggles, gloves, and masks (when employees aren't alone); frequent hand washing; routine sanitation of the workfloor; social distancing; monitoring body temperature; and quarantine of exposed and sick employees. These measures won't only control the spread of Covid-19 within the company, but also increase your net profit under the assumptions of the model.

"We show that a business entity may stand a good opportunity to generate positive net profit after reopening only if necessary protection measures are strictly implemented," warns Miao. "It is also very important to monitor the number of infections through virus testing and contact tracing, especially at the early stage of reopening."

About the model

Miao and colleagues first developed - and (approximately) solved numerically - five differential equations for the numbers of susceptible, infectious, quarantined, deceased, and recovered employees within a company. These assumed that all workers who can work from home do so, and that workers self-quarantine as soon as they present symptoms, or if they have been in close contact with a known carrier. They further assumed that infected employees who aren't detected - because they are asymptomatic or only mildly symptomatic cases, in the early stages of the disease, or apparently recovered but still infectious - can continue to infect their susceptible coworkers as "silent spreaders", and that sick and quarantined workers receive their full pay.

In addition, the authors modeled the net profit, based on the average salary and productivity of US workers, the cost of PPE and other safety measures, and the reduction in productivity expected from a limit on working hours and the need for distancing. They estimated values for key parameters from the literature, for example the effectiveness of PPE in preventing transmission, the expected pricetag of these measures, and the dynamics of infection.

Four scenarios compared

The authors then took a large, well-known Texan company as a hypothetical example. Under the least safe scenario, where no safety measures are taken, the prevalence of Covid-19 within the company steadily rises to become 30-fold higher than in the general US population, indicating that reopening won't be feasible. Under the safest scenario, where all possible safety measures are adopted, its prevalence falls to 104-fold lower than in the population, resulting in a higher and more stable net profit. Results are similar under the second-safest scenario, where only the most expensive measures are omitted - non-contact sensors for real-time fever detection, reducing working hours by 30% to limit exposure, and UV purification or High-Efficiency Particulate Air (HEPA) filters that prevent viral transmission in aerosols. Finally, under the third-safest scenario, where employees further drop the use of PPE, the workplace again quickly becomes a "hot spot" of infection, resulting in a lower net profit.


Related Infections Articles from Brightsurf:

Understanding the progress of viral infections
A team of researchers at the Institute for the Genetics of Heart Diseases at M√ľnster University created a viral expression model that can be used to simulate and analyse a large number of viral infections - including the one with SARS-CoV-2.

How viral infections associated with cancer become persistent?
A new study led by Pedro Simas, group leader at Instituto de Medicina Molecular (iMM; Portugal) and Kenneth M.

New drug formulation could treat Candida infections
With antimicrobial resistance (AMR) increasing around the world, new research led by the University of Bristol has shown a new drug formulation could possibly be used in antifungal treatments against Candida infections.

A 'shocking' new way to treat infections
New research from the University of Pittsburgh's Swanson School of Engineering introduces a revolutionary treatment for these infections.

Young infants with fever may be more likely to develop infections
Infants with a high fever may be at increased risk for infections, according to research from Penn State College of Medicine.

Hospital infections declining in Canada
There is good news on the infection front: infections acquired by patients in Canadian hospitals are declining, with a 30% reduction between 2009 and 2017, according to new research in CMAJ (Canadian Medical Association Journal).

Helminthic infections may be beneficial against HIV-1
Infection with parasitic helminths can reduce the susceptibility of T-cells to HIV-1 infection, according to a study published Sept.

Waking up sleeping bacteria to fight infections
Researchers in the group of Jan Michiels (VIB-KU Leuven Center for Microbiology) identified a mechanism of how sleepy bacteria wake up.

Typhoid vaccine may protect against other infections
New research by the University of Liverpool and Liverpool School of Tropical Medicine shows that vaccination with weakened strains of Salmonella may also protect against other infections.

New AI can detect urinary tract infections
New AI developed at the University of Surrey could identify and help reduce one of the top causes of hospitalisation for people living with dementia: urinary tract infections (UTI).

Read More: Infections News and Infections Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to