# SARS-CoV-2 infection and complicated appendicitis in adults in Lima, Peru: a matched case-control study

## TL;DR

This study found that SARS-CoV-2 infection is associated with a higher risk of complicated appendicitis in adults in Lima, Peru.

## Contribution

The study provides evidence of a link between SARS-CoV-2 infection and complicated appendicitis in a matched case-control design.

## Key findings

- The positivity rate for COVID-19 was significantly higher in complicated appendicitis cases (73.6%) compared to controls (26.4%).
- The adjusted odds ratio showed that SARS-CoV-2 infection was associated with a 3.52 times higher risk of complicated appendicitis.
- The association remained significant after adjusting for symptom onset time and waiting time before surgery.

## Abstract

Acute appendicitis may be uncomplicated or may present with life threatening complications. Since the outbreak of the COVID-19 pandemic, there has been an increase in the number of cases of complicated appendicitis, suggesting a possible association between them. Therefore, we aimed to determine the association between SARS-CoV-2 infection and complicated appendicitis in surgical patients in Lima, Peru, from March 2020 to December 2021.

A matched case-control study was conducted. Clinical records of patients ≥ 18 years old who underwent surgery for appendicitis and had at least one positive SARS-CoV-2 diagnostic test were selected. Patients undergoing surgery for complicated appendicitis were considered cases, and patients undergoing surgery for uncomplicated appendicitis were controls. A 1:1 matching by sex, age, and month of surgery was performed. Conditional logistic regression modeling was performed to calculate crude and adjusted conditional odds ratios (cOR).

The positivity rate for COVID-19 tests was 73.6% for cases and 26.4% for controls. The crude cOR was 4.88 (95% IC 2.89–8.23, p < 0.001), and the adjusted cOR was 3.52 (95%IC 1.82–6.81, p = 0.001), after controlling for onset time of symptoms and awaiting time before surgery.

Surgery for complicated appendicitis was associated with SARS-CoV-2 infection. Patients with this infection may be at higher risk of complicated appendicitis and thus may need additional clinical monitoring.

The online version contains supplementary material available at 10.1186/s12893-025-02897-7.