Please select the eligibility criteria that correspond to the clinical trial below.
Title: STOPFLU: Is it Possible to Reduce the Number of Days Off in Office Work by Improved Hand-hygiene?
Brief Summary: Improved hand hygiene is known to reduce transmission of both respiratory (RTI) and gastrointestinal infections (GTI) under "semi-closed" conditions such as hospitals, day-care centres and schools. It is not known if similar interventions would have the desired effect in a regular office work. This study is aiming to investigate this possibility by recruiting volunteers from several companies in the Helsinki Region. The two intervention groups will receive detailed instructions e.g. for proper coughing and sneezing, and for regular cleaning of hands with either standard liquid soap or with alcohol-based gel rubbing. Third group will serve as the control and is advised not to change their previous behaviour in this respect. The participants will report weekly possible RTI or GTI symptoms and related days off through internet. The study is planned to run about 18 months to cover the seasonal variation of the epidemics of the causative different viruses.


Options:
A: Inclusion Criteria:

* Residence in selected University of Michigan Residence Halls

Exclusion Criteria:

* Non-residence in selected Residence Halls
* Unwillingness to utilize face mask and hand sanitizer and complete online surveys
* Already study employee
B: Inclusion Criteria:

* Volunteers working in defined units

Exclusion Criteria:

* Persons with open wounds or chronic eczema in hands
C: Inclusion Criteria:

* Age 18 years or older
* Negative RT-PCR test at the beginning of the study.
* Negative SARS-CoV-2 serological Elecsys Anti-Sars-CoV-2 test at the beginning of the study.
* Living in a geographic area with active COVID-19 transmission (number of
* cases reported locally).
* Living in a geographic area that has been determined by the Colombian National Statistics Department (DANE) to have a medium, medium-high, and high vulnerability index (higher prevalence of comorbidities and social and economic vulnerabilities.
* Working outside the home for at least two days a week, during the last week.
* Acceptance to participate in the study regardless of the trial arm assignment through verbal informed consent.

Exclusion Criteria:

* Retired adults or unemployed
* Adults referring previous diagnosis of COVID-19 confirmed by RT-PCR tests or serological antibody tests.
D: Study Population Description:

The subject population will be young children and their mothers/guardians living in several contiguous districts of Western Province, in the rural areas outside the towns of Bungoma and Kakamega. Communities must meet the following criteria:

* Located in a rural area (defined as villages with \<25% residents living in rental houses, \<2 gas/petrol stations and \<10 shops)
* Not enrolled in ongoing WASH or nutrition programs
* No chlorine dispensers at water sources installed by programs separate from the present study
* Majority (\>80%) of households do not have access to piped water into the home
* At least six eligible pregnant women in the cluster at baseline.

From enrolled communities, household compounds will be enrolled if they meet the following criteria.

Inclusion Criteria:

1. One or more women who self-identify as pregnant at the time of the baseline survey
2. The woman plans to stay in the community for the next 12 months.

Exclusion Criteria:

(1) The study excludes households who do not own their home to help mitigate attrition during follow-up.

Answer: B