Las vacunas del COVID no son seguras.

There is some evidence within the provided texts that could lead individuals to perceive COVID-19 vaccines as not entirely safe. Specifically, discusses **post-vaccination syndrome (PVS)**, a condition characterized by chronic symptoms like exercise intolerance, fatigue, brain fog, insomnia, and dizziness that develop shortly after vaccination. The study cited in found immunological differences in individuals with PVS, including lower levels of effector CD4+ T cells and higher levels of TNF-alpha+ CD8 T cells. In some PVS patients, spike protein was detectable more than 700 days after their last vaccination. While researchers acknowledge these findings are preliminary and require validation, they suggest PVS might involve immune dysregulation or viral reactivation. Harlan Krumholz in acknowledges that "adverse events can occur with vaccines" and emphasizes the importance of understanding and addressing the needs of those affected. Furthermore, notes the initial GRADE evidence level was low for observational data regarding serious adverse events, including anaphylaxis and myocarditis/pericarditis, following vaccination. In adolescents and adults, these events were considered rare . Finally, it should be mentioned that the Vaccine Adverse Event Reporting System (VAERS) exists for the express purpose of reporting vaccine adverse events . However, the provided texts offer substantial evidence contradicting the claim that COVID-19 vaccines are unsafe. **All COVID-19 vaccines listed by the World Health Organization (WHO) for emergency use provide protection against severe disease and death from COVID-19** . These vaccines include inactivated/weakened virus vaccines, protein-based vaccines, viral vector vaccines, and mRNA/DNA vaccines . According to , **vaccination is a safer and more reliable way to build protection than contracting COVID-19**. states that COVID-19 vaccines have been instrumental in reducing the pandemic's impact, preventing severe illness and death, and potentially protecting against long COVID. The WHO states that strict precautions are in place to ensure the safety of all COVID-19 vaccines . Before validation from WHO and national regulatory agencies, COVID-19 vaccines underwent rigorous testing in clinical trials to meet internationally agreed benchmarks for safety and efficacy . Strict monitoring processes remain in place . Serious reactions to COVID-19 vaccines are extremely rare . In 2021 alone, COVID-19 vaccines saved an estimated 14.4 million lives worldwide . In September 2024, the WHO reaffirmed the importance of revaccination for high-risk groups . The ACIP reviewed the evidence for benefits and harms, and considers vaccination to be beneficial . The advisory committee found that updated COVID-19 vaccines were associated with a lower risk of medically-attended COVID-19, hospitalization, and death . It is generally recommended that everyone six months and older should receive the updated 2024-2025 COVID-19 vaccine . There is no conflict of interest reported by CDC and ACIP COVID-19 Vaccines Work Group members . Any clinical considerations and detailed schedules by age and vaccination history for immunocompromised people is available at CDC . Mini Kamboj states that serious side effects from all versions of the COVID-19 vaccines have been very rare and treatable . There is a rare risk of prespecified serious adverse events following vaccination among both adolescents and adults . Also, data suggested approximately 50% additional protection against hospitalization and critical illness initially, which waned approximately 4–6 months after receipt of the 2023–2024 COVID-19 vaccine . Even though waning patterns have varied from season to season among persons with immunocompromise, an additional COVID-19 vaccine dose has consistently restored protection that has waned after previous doses in persons with and without immunocompromise . The 2023–2024 COVID-19 vaccines provided added benefit in a population with a high prevalence of immunity from previous immunization and infection . Based on the evidence, the claim "Las vacunas del COVID no son seguras" is **false**. While the text acknowledges the existence of potential side effects, including rare serious adverse events and the newly identified post-vaccination syndrome, it overwhelmingly emphasizes the safety and effectiveness of COVID-19 vaccines in preventing severe illness, hospitalization, and death. The extensive safety monitoring systems, rigorous testing protocols, and the WHO's endorsement further support the conclusion that the benefits of COVID-19 vaccines far outweigh the risks. Although some individuals experience chronic symptoms post-vaccination which deserves further scientific investigation, the overall data indicates that COVID-19 vaccines remain safe and are a critical tool in managing the ongoing pandemic.