The 4th International Workshop on Participatory Surveillance is intended for those invested in the successful application of participatory surveillance. It is anticipated attendees will include epidemiologists, researchers, academics, government officials, philanthropists, representatives from community organizations, and technology experts. Attendance is open for all to apply.

IWOPS IV is an opportunity for diverse members of the disease surveillance community from around the world to gather and share experiences and best practices, and explore the future applications of this approach. See the specific meeting objectives on the Program page.

Prior IWOPS have focused on influenza like illness, data sharing, ethics and privacy. Learn more about IWOPS history on the IWOPS History page.

Registering and Attending IWOPS IV

You will need to apply by April 15, 2022. After you apply, you will be notified if you have been accepted to attend IWOPS IV by May 16. You will have until June 15, 2022 to register and confirm your attendance by submitting a registration fee.

If your application has been accepted and you are invited to attend IWOPS IV, you will receive an email of acceptance with a link to register online.

Registration will open May 16, 2022 and must be completed by June 15, 2022.

Consideration for attendance requires submission of an online application, which can be found here. Notifications of acceptance or waitlist placement will be made after June 15, 2022. We will notify those added to the waitlist with a qualified application on a rolling basis as positions open.

There is a general registration fee of $250; $50 for students and people in training. The registration fee helps offset the cost of food and refreshments through the duration of the workshop. Please note that all travel and accommodation costs are the responsibility of each participant.

Yes, limited financial support will be available for people from under-represented groups, under-resourced communities, and/or are from a low-income country with expressed financial need. The online application provides a section for you to share how you meet these criteria to qualify for a scholarship. If you do qualify, we will send you the materials necessary to apply for financial assistance.


IWOPS IV is planned as an in-person event October 31-November 3, 2022 in Phnom Penh, Cambodia. Given the uncertainties of COVID-19 and its variants around the world, we will continue to monitor the situation to ensure equitable access and the health of all participants. We are not considering a virtual event given the highly interactive nature of this workshop.

We do not anticipate IWOPS IV will have a virtual component.

For IWOPS IV, we will be taking proactive steps to help ensure the health and safety of all participants. Specific requirements, consistent with WHO and Cambodia CDC guidelines, will be confirmed closer to the date of the workshop and based on the global COVID-19 situation. We cannot guarantee full protection from COVID-19. If we are able to proceed, we anticipate participants will follow requirements that will include:

• proof of vaccination
• wearing a face mask covering nose and mouth based on local guidelines and recommendations
• avoiding attending any event should you develop COVID-19 symptoms during the course of IWOPS IV

We will also be ensuring that all meeting spaces are well-ventilated and have hand sanitizer available. Beyond these measures, all participants are assuming full responsibility for their own health and safety. Please check back often for updates to our policy and to learn the latest requirements.

Yes. For the health and safety of all attending and involved with IWOPS IV, attendees are required to be vaccinated. See these websites for reference and details about COVID-19 and vaccination requirements in Cambodia:

Cambodia Visa
Kingdom of Cambodia COVID-19 Reference
SafeTravel Cambodia

Please monitor these sites and our website regularly for any updates on safe travel to Cambodia.

Travel to Cambodia

You can find much of what you need to know in the Travel Information section on the IWOPS Hotel/Travel page.

IWOPS IV is a highly interactive in-person event and is not designed for virtual participation.

If you have already registered for IWOPS IV and must withdraw due to extenuating circumstances, contact us at events@endingpandemics.org as soon as you are aware of your circumstances. Your withdrawal will provide an opportunity for someone on the waiting list to attend. You will be subject to penalties from the registration costs as noted on this page.

Who to Contact about IWOPS IV

Please email questions about IWOPS IV to Elizabeth Aaron, IWOPS IV coordinator, at events@endingpandemics.org. Please allow up to 48 hours for a response.