Measures do not prevent deaths, transmission is not by contact, masks provide no benefit, vaccines are inherently dangerous: Review update of recent science relevant to COVID-19 policy – Denis Rancourt, Research Gate

The unprecedented measures of universal lockdowns, tight institutional lockdowns of care homes, universal masking of the general population, obsession with surfaces and hands, and the accelerated vaccine deployment are contrary to known science, and contrary to recent leading studies. There has been government recklessness by action and negligence by omission. Institutional measures have been needed for a long time to stem corruption in both medicine and public health policy.


Masks Don’t Work: A Review of Science Relevant to COVID-19 Social Policy – Denis Rancourt (PhD) The River Cities’ Reader

No RCT study with verified outcome shows a benefit for HCW or community members in households to wearing a mask or respirator. There is no such study. There are no exceptions.

Likewise, no study exists that shows a benefit from a broad policy to wear masks in public.

Furthermore, if there were any benefit to wearing a mask, because of the blocking power against droplets and aerosol particles, then there should be more benefit from wearing a respirator (N95) compared to a surgical mask, yet several large meta-analyses, and all the RCT, prove that there is no such relative benefit.

Regarding the aerosol mechanism of infectious disease transmission:

Mask stoppage efficiency and host inhalation are only half of the equation, however, because the minimal infective dose (MID) must also be considered. For example, if a large number of pathogen-laden particles must be delivered to the lung within a certain time for the illness to take hold, then partial blocking by any mask or cloth can be enough to make a significant difference.

On the other hand, if the MID is amply surpassed by the virions carried in a single aerosol particle able to evade mask-capture, then the mask is of no practical utility, which is the case.

[I]f anything gets through (and it always does, irrespective of the mask), then you are going to be infected. Masks cannot possibly work. It is not surprising, therefore, that no bias-free study has ever found a benefit from wearing a mask or respirator in this application.

Regarding minimal infective dose:

  • Most respiratory viruses are as infective in humans as in tissue culture having optimal laboratory susceptibility
  • It is believed that a single virion can be enough to induce illness in the host
  • The 50-percent probability MID (“TCID50”) has variably been found to be in the range 100−1000 virions
  • There are typically 10 to 3rd power − 10 to 7th power virions per aerolized influenza droplet with diameter 1 μm − 10 μm
  • The 50-percent probability MID easily fits into a single (one) aerolized droplet
  • For further background:
  • A classic description of dose-response assessment is provided by Haas (1993).
  • Zwart et al. (2009) provided the first laboratory proof, in a virus-insect system, that the action of a single virion can be sufficient to cause disease.
  • Baccam et al. (2006) calculated from empirical data that, with influenza A in humans,“we estimate that after a delay of ~6 h, infected cells begin producing influenza virus and continue to do so for ~5 h. The average lifetime of infected cells is ~11 h, and the half-life of free infectious virus is ~3 h. We calculated the [in-body] basic reproductive number, R0, which indicated that a single infected cell could produce ~22 new productive infections.”
  • Brooke et al. (2013) showed that, contrary to prior modeling assumptions, although not all influenza-A-infected cells in the human body produce infectious progeny (virions), nonetheless, 90 percent of infected cell are significantly impacted, rather than simply surviving unharmed.

Regarding tests for a wide-scale mask-wearing policy:

  • Any benefit from mask-wearing would have to be a small effect, since undetected in controlled experiments, which would be swamped by the larger effects, notably the large effect from changing atmospheric humidity.
  • Mask compliance and mask adjustment habits would be unknown.
  • Mask-wearing is associated (correlated) with several other health behaviors; see Wada (2012).
  • The results would not be transferable, because of differing cultural habits.
  • Compliance is achieved by fear, and individuals can habituate to fear-based propaganda, and can have disparate basic responses.
  • Monitoring and compliance measurement are near-impossible, and subject to large errors.
  • Self-reporting (such as in surveys) is notoriously biased, because individuals have the self-interested belief that their efforts are useful.
  • Progression of the epidemic is not verified with reliable tests on large population samples, and generally relies on non-representative hospital visits or admissions.
  • Several different pathogens (viruses and strains of viruses) causing respiratory illness generally act together, in the same population and/or in individuals, and are not resolved, while having different epidemiological characteristics.

Unanswered questions about mask-wearing:

  • Do used and loaded masks become sources of enhanced transmission, for the wearer and others?
  • Do masks become collectors and retainers of pathogens that the mask wearer would otherwise avoid when breathing without a mask?
  • Are large droplets captured by a mask atomized or aerolized into breathable components? Can virions escape an evaporating droplet stuck to a mask fiber?
  • What are the dangers of bacterial growth on a used and loaded mask?
  • How do pathogen-laden droplets interact with environmental dust and aerosols captured on the mask?
  • What are long-term health effects on HCW, such as headaches, arising from impeded breathing?
  • Are there negative social consequences to a masked society?
  • Are there negative psychological consequences to wearing a mask, as a fear-based behavioral modification?
  • What are the environmental consequences of mask manufacturing and disposal?
  • Do the masks shed fibers or substances that are harmful when inhaled?

Publications Videos

Masks Don’t Work: A review of science relevant to COVID-19 social policy – ResearchGate

Masks and respirators do not work. There have been extensive randomized controlled trial (RCT) studies, and meta-analysis reviews of RCT studies, which all show that masks and respirators do not work to prevent respiratory influenza-like illnesses, or respiratory illnesses believed to be transmitted by droplets and aerosol particles. Furthermore, the relevant known physics and biology, which I review, are such that masks and respirators should not work. It would be a paradox if masks and respirators worked, given what we know about viral respiratory diseases: The main transmission path is long-residence-time aerosol particles (< 2.5 μm), which are too fine to be blocked, and the minimum-infective-dose is smaller than one aerosol particle. The present paper about masks illustrates the degree to which governments, the mainstream media, and institutional propagandists can decide to operate in a science vacuum, or select only incomplete science that serves their interests. Such recklessness is also certainly the case with the current global lockdown of over 1 billion people, an unprecedented experiment in medical and political history.’t_Work_A_review_of_science_relevant_to_COVID-19_social_policy

Update: The link no longer works but an archive on is available:’t_Work_A_review_of_science_relevant_to_COVID-19_social_policy

Update 2 July 2020: Denis Rancourt talks about his paper in this video.

Update 30 July 2020: Del Bigtree’s channel has been censored by YouTube. His video with Denis Rancourt has been mirrored below.