Feasibility, Acceptability, and Cost of Community-Based Self-monitoring among Sex Workers Testing Positive for COVID-19 in Zimbabwe: A Mixed-methods Study.

A mixed-methods study in Zimbabwe demonstrates that a co-developed intervention providing risk-differentiated support and two-week food packs to sex workers testing positive for COVID-19 was feasible, acceptable, and cost-effective, though addressing stigma remains crucial for optimizing future implementation.

The Gist

Imagine a group of people who work late at night, selling their time and safety to strangers to put food on their tables. These are sex workers in Zimbabwe. When the COVID-19 pandemic hit, they faced a terrifying catch-22: If they got sick, they had to stay home and isolate to stop the virus from spreading. But if they stayed home, they had no money to buy food.

It was like being told, "You must stay in your house to save the world, but if you do, your family will starve." Naturally, many chose to keep working, even when sick, because survival came first.

This paper tells the story of a clever, compassionate experiment designed to solve this impossible puzzle.

The Problem: The "Starving Isolation" Trap

Before this study, sex workers were terrified of getting tested for COVID-19. Why? Because a positive test meant a mandatory quarantine. For these workers, quarantine meant no income. Without income, they couldn't feed their children or pay rent. So, they avoided testing, stayed sick, and kept working, unknowingly spreading the virus.

The Solution: The "Food Hamper" Lifeline

The researchers didn't just tell the government what to do; they sat down with the sex workers and asked, "What would actually help you stay home?"

The answer was simple but powerful: Food.

They co-created a plan that worked like a safety net:

1. The Test: Sex workers could get tested easily at their usual health clinics.
2. The Triage (The Traffic Light System):
   • Red Light (Severe): If you were very sick, you got immediate help to get to a hospital.
   • Yellow Light (Moderate): If you were sick but could walk, you stayed home.
   • Green Light (Mild): If you had just a cough, you stayed home.
3. The Magic Ingredient: For anyone staying home (Yellow or Green), the program gave them a massive food pack (enough to feed a family of four for two weeks). This was valued at about $25.

Think of this food pack as a "Stay-Home Ticket." It removed the fear of starvation. Now, staying home didn't mean your family would go hungry; it meant you had a full pantry and a safe place to recover.

How It Worked in Real Life

The study ran for a few months, and the results were like turning on a light in a dark room:

• More People Got Tested: Before the food packs, very few people wanted to be tested. Once the "Stay-Home Ticket" (food) was announced, the number of people getting tested tripled. It was as if a rumor spread: "If you get sick, you get fed." People who were previously hiding their symptoms suddenly felt safe enough to come forward.
• They Actually Stayed Home: The food packs worked. Women who received them said, "If I didn't have this food, I would have had to go out and work to feed my kids. Now, I can stay in bed and get better."
• Self-Monitoring: They were given a small device called a pulse oximeter (a little clip that goes on your finger to check oxygen levels). They were taught: "If the number drops below 90, call us immediately." Most women learned to use it well, acting like their own health detectives.

The Hiccups (It wasn't perfect)

Even with the food, there were still some bumps in the road:

• The "Rent" Problem: The food pack solved hunger, but it didn't solve rent or school fees. Some women were still stressed about money they couldn't earn while isolating. They suggested that maybe cash would be even better than food.
• The Fear of Gossip: Some women were afraid that if a health worker came to their door to check on them, their neighbors or landlords would find out they had COVID. In a crowded neighborhood, this fear of being "outed" kept some women from asking for help when they felt worse.
• Confusing Instructions: A few women got confused by the numbers on their oxygen clip. One woman thought her numbers were going up (which is good) when she actually meant they were going down (which is bad). It showed that instructions need to be super simple, like a picture book, not a textbook.

The Price Tag

The researchers did the math. How much did this cost?

• About $54 per person (including the cost of designing the program).
• This is surprisingly cheap. Think of it this way: It cost less than a single night in a hospital or a few days of a doctor's salary to keep someone safe at home. Compared to other countries where treating COVID-19 costs hundreds of dollars, this was a bargain.

The Big Takeaway

This study teaches us a simple but profound lesson: You cannot ask people to follow health rules if those rules break their ability to survive.

If you tell a hungry person to stay home, they will ignore you. But if you give them a full fridge and a safe place to rest, they will listen. By combining food with healthcare, the program didn't just stop the virus; it showed respect for the people it was trying to help.

In short: To stop a pandemic, you need more than just medicine and rules. You need to understand the human heart and the empty stomach. When you feed the body, the mind is free to follow the rules.

Technical Summary

1. Problem Statement

Sex workers in Zimbabwe faced significant barriers to adhering to COVID-19 isolation guidelines following a positive diagnosis. The primary driver was financial pressure; isolation meant an immediate loss of income, leaving them unable to feed their families. Consequently, many sex workers avoided testing or failed to isolate, increasing community transmission risks. Furthermore, existing health systems lacked tailored post-test support for this key population, and stigma associated with both sex work and COVID-19 prevented individuals from seeking necessary care. The study aimed to address these gaps by co-developing and evaluating a community-based intervention that combined risk-differentiated medical support with economic incentives.

2. Methodology

The study employed a mixed-methods design (quantitative, qualitative, and economic costing) conducted between March and June 2023 across 12 clinics within Zimbabwe's national Key Populations (KP) Program.

• Intervention Development: The intervention was co-developed in October 2021 through workshops with sex workers (including female, male, and transgender), peer educators, and health stakeholders.
• Intervention Components:
  • Risk-Differentiated Support: Upon testing positive, sex workers were screened for severity.
    • Severe cases: Immediate hospitalization and treatment.
    • Mild/Moderate cases: Community-based self-monitoring with pulse oximeters, medical prescriptions, and contact with health workers.
  • Economic Incentive: A 14-day food pack (valued at ~$25) containing basic staples (mealie meal, kapenta, oil) to alleviate financial pressure during isolation.
• Evaluation Framework: The study utilized Proctor's Implementation Framework to assess:
  • Adoption: Measured via program data on testing uptake before and during the intervention.
  • Acceptability, Feasibility, Appropriateness, and Fidelity: Assessed through in-depth interviews (IDIs) with 34 sex workers (26 pre-intervention, 8 during) and 29 health workers (24 pre-intervention, 5 during).
  • Costing: A micro-costing approach from a health system perspective was used to calculate start-up (co-development) and implementation costs, amortized over a 4-year period for development and a 2-year period for equipment.

3. Key Contributions

• Co-Design Approach: The study demonstrates the efficacy of involving end-users (sex workers) in designing health interventions, ensuring the solution (food packs) directly addressed the root cause of non-adherence (food insecurity).
• Risk-Differentiated Community Care: It successfully adapted a hospital-centric model to a community-based model using pulse oximeters and clear triage protocols for a marginalized population.
• Economic Evidence: It provides granular cost data for a community-based isolation model in a low-resource setting, offering a benchmark for future pandemic responses targeting key populations.
• Stigma Analysis: It highlights the specific intersection of occupational stigma and disease stigma as a barrier to care, even when financial barriers are partially addressed.

4. Key Results

A. Adoption and Uptake

• Testing Increase: The introduction of the intervention was associated with a significant increase in testing uptake.
  • Pre-intervention: 2.5% of screened individuals met criteria for testing; 49.1% of those tested positive.
  • During intervention: 4.5% met criteria for testing; 65.1% of those tested positive.
  • Weekly testing volume tripled from an average of 5 to 15 tests per week.
• Unanticipated Effect: Health workers reported that the promise of food packs encouraged some sex workers to report symptoms they might have previously hidden, though some also expressed disappointment if they tested negative and missed the incentive.

B. Feasibility and Acceptability

• High Acceptability: Both sex workers and health workers found the intervention highly acceptable. The food packs were cited as the primary factor enabling isolation.
• Feasibility of Self-Monitoring: Participants successfully used pulse oximeters to monitor oxygen saturation. However, there were instances of misinterpretation (e.g., anxiety over rising numbers which were actually good), indicating a need for better instruction validation.
• Fidelity: Health workers adhered strictly to risk assessment protocols. Of the 9 positive cases identified during the pilot, 8 were managed at home, and 1 severe case was referred to a hospital.

C. Challenges

• Residual Financial Vulnerability: While food packs solved immediate hunger, they did not cover other costs (rent, school fees, medical bills). Some participants still felt pressure to work or faced eviction threats.
• Stigma: Fear of disclosure to landlords or neighbors prevented some participants from seeking help even when symptoms worsened.
• Living Conditions: Overcrowded housing made strict isolation and preventing household transmission difficult.

D. Cost Analysis

• Total Costs: The total annualized cost of the program was $484.06 (including development) or $441.56 (implementation only).
• Unit Cost: The cost per sex worker testing positive and self-monitoring was:
  • $49.06 (excluding development costs).
  • $53.78 (including development costs).
• Cost Drivers:
  • Food packs: 41%
  • Initial COVID-19 testing: 26%
  • Medical prescriptions: 21%
  • Personnel, start-up, and equipment: 12% combined.

5. Significance and Conclusion

The study concludes that a co-developed, community-based self-monitoring intervention is a feasible, acceptable, and cost-effective strategy for managing COVID-19 among sex workers in Zimbabwe.

• Comparative Advantage: At ~$54 per participant, the cost is significantly lower than hospital-based management and compares favorably with similar home-care interventions in Kenya and Ghana.
• Policy Implications:
  • Social Protection: Food packs are effective but insufficient alone; future interventions should consider cash transfers or broader social protection to address non-food financial pressures.
  • Stigma Reduction: Structural interventions and anti-stigma campaigns are critical to ensure sex workers seek care when symptoms worsen.
  • Instruction Clarity: Future iterations must include context-specific validation of self-monitoring instructions to prevent unnecessary anxiety.

This model offers a scalable blueprint for managing infectious diseases among marginalized populations during pandemics, emphasizing that economic support is a prerequisite for public health compliance in vulnerable communities.