Persistence, prevalence, and polymorphism of sequelae after COVID-19 in young adults

COVID-19’s long-term impact on young adults has been an area of growing concern and interest. A comprehensive study titled “Persistence, prevalence, and polymorphism of sequelae after COVID-19 in young adults,” led by Jeremy Werner Deuel and others, sheds light on this critical issue.

Here’s a detailed summary of their findings and methodology:


The study, conducted on young Swiss Armed Forces personnel, aimed to understand the sequelae (after-effects) of COVID-19, especially in non-hospitalized young adults. This demographic is significant as it encompasses a large portion of the workforce, including healthcare workers.


The research was a prospective longitudinal cohort study involving 501 participants with a median age of 21. The study compared individuals with a prior COVID-19 diagnosis to those never infected. A broad array of tests assessed the impact of COVID-19 on various body systems, including cardiovascular, pulmonary, neurological, renal, ophthalmological, male reproductive, psychological, and general health.

Key Findings

  1. Metabolic Disorders:
    • Post-COVID participants, more than six months after infection, showed a significant trend towards metabolic disorders, including higher Body Mass Index (BMI), lower aerobic threshold, and elevated blood cholesterol and low-density lipoprotein (LDL) levels.
  2. Psychological and Sensory Effects:
    • The study noted more reported fatigue in the post-COVID group compared to asymptomatic individuals.
    • Significant hyposmia (reduced sense of smell) was observed in recent COVID-19 cases (less than six months post-diagnosis), indicating potential reversibility of this condition.
    • Recent COVID-19 cases showed higher anxiety and post-traumatic stress scores, but these effects seemed to reverse after more than six months.
  3. Male Fertility:
    • Recent infections were associated with poorer motile sperm counts, but this effect was not significant in non-recent infections, suggesting potential reversibility.
  4. Neutralizing Antibodies:
    • Recovered and vaccinated individuals exhibited high neutralizing antibody titers, emphasizing the importance of vaccination even for those who have recovered from COVID-19.


The study highlights the multi-system impact of COVID-19, even in mild cases among young adults. While the overall impact seems less severe than in older or hospitalized patients, the presence of metabolic disorders, dyslipidemia, and reduced physical endurance points to potential long-term health risks. The study’s findings are crucial for developing strategies for the interdisciplinary evaluation and management of COVID-19 sequelae.

Strengths, Limitations, and Future Directions

  • Strengths: A uniquely comprehensive test battery, a control group, and objective, quantitative analyses.
  • Limitations: A low proportion of female participants limited the sex-based analysis of sequelae.
  • Future Research: Expansion of the test battery for other populations, especially young women, and further follow-up to understand the trajectory and pathophysiology of the identified sequelae.

In conclusion, this study provides valuable insights into the long-term effects of COVID-19 in young adults. While it brings a ray of hope with the possibility of recovery in many body systems, it also underscores the need for continued vigilance and support for individuals experiencing prolonged effects post-infection. The research sets a precedent for future studies and healthcare strategies to address the aftermath of COVID-19 in younger demographics.

Read More:

Leave a comment