Library.

“The SARS-CoV-2 Omicron XBB subvariant is lethal and is not easy to detect.”

The claim overstates both the danger and the diagnostic difficulty of XBB. Authoritative human data show XBB was not unusually deadly compared with other Omicron lineages, even though severe illness and death could still occur in high-risk people. Standard COVID-19 tests continued to detect XBB; only some specific assay targets or variant-tracking markers were affected.

“SARS-CoV-2 (the virus that causes COVID-19) escaped from a laboratory in China.”

The evidence does not support treating a Chinese lab escape as established fact. The most authoritative scientific reviews and institutional assessments say the origin remains unresolved, with the overall evidentiary weight leaning toward zoonotic spillover linked to the wildlife trade and Huanan market. Some intelligence bodies consider a lab-associated incident plausible, but only with low or moderate confidence and without direct proof.

“COVID-19 originated from a laboratory in China.”

Available evidence does not establish that COVID-19 originated from a Chinese laboratory. Scientific reviews and WHO-linked assessments continue to find zoonotic spillover better supported, while lab-origin arguments rely mainly on circumstantial facts and divided, low-confidence intelligence judgments rather than direct evidence. A lab incident cannot be fully ruled out, but stating it as fact goes beyond what the evidence supports.

“Hantavirus is less infectious than SARS-CoV-2 was during the 2019–2020 COVID-19 outbreak.”

The evidence strongly supports the comparison in ordinary public-health terms. SARS-CoV-2 spread efficiently between humans during the 2019-2020 outbreak, while hantavirus infections are usually rodent-to-human and rarely spread person-to-person. Limited Andes virus exceptions do not overturn the broader conclusion.

“Severe COVID-19 infection can increase the risk of faster lung cancer development.”

Multiple peer-reviewed studies and academic medical centers report an association between severe COVID-19 (hospitalization-level) and increased subsequent lung cancer incidence, supported by plausible inflammatory mechanisms. However, the claim omits critical context: the epidemiological evidence is correlational, not causal; the strongest mechanistic research involves metastatic cancer cell reactivation rather than new lung tumor formation; no major health authority has confirmed SARS-CoV-2 as a lung carcinogen; and vaccination appears to mitigate the risk. The association is real, but the causal framing is premature.

“The COVID-19 virus was engineered in a laboratory.”

The claim that COVID-19 was "engineered" in a laboratory is not supported by the available evidence. While some U.S. intelligence agencies and political bodies have entertained a "lab leak" or "research-related incident" as plausible, this is a fundamentally different claim from deliberate genetic engineering. The WHO, peer-reviewed genomic analyses, and scientific meta-analyses consistently find no credible evidence of engineering, and most intelligence assessments explicitly state the virus was probably not genetically engineered.

“COVID-19 vaccinated individuals die from the Delta variant at higher rates than unvaccinated individuals.”

This claim is false. Multiple high-authority CDC and peer-reviewed studies consistently found that unvaccinated individuals died from the Delta variant at 11 to 53 times the rate of vaccinated individuals. Vaccine effectiveness against Delta-related death was 90–91%. The claim likely stems from a well-documented statistical misunderstanding: in highly vaccinated populations, raw death counts among vaccinated people can appear large, but per-capita death rates were dramatically lower for vaccinated individuals.