The group designated in Saskatchewan as Clinically Extremely Vulnerable (CEV) is a heterogenous clinical population with factors that impair their immune response to differing degrees.
Very Limited evidence is currently available to assess the immune response following vaccination is selected clinical populations; no evidence is available to assess vaccine efficacy or effectiveness in these populations. The clinical relevance of measured immune response with respect to protection from disease is still uncertain.
In considering the immune response of the CEV population, it is recommended that the absolute difference in immune response between 1 and 2 doses be considered, as it is possible some patient groups will have lowered protection regardless of vaccine strategy.
In terms of clinical subgroups:
oOrgan transplantation recipients on immunosuppressive medication: solid organ transplant recipients receiving anti-metabolite maintenance immunosuppression therapy were less likely to develop an antibody response to an mRNA vaccine, compared to those receiving other types of therapies (37% vs 63%). In a study of 242 kidney transplant recipients on immunosuppressive therapy only 10.8% became seropositive at 28 days after a single dose of mRNA vaccine.
oCancer: A study of 151 elderly patients with solid and hematological malignancies and 54 healthy controls who received one or two doses of BNT162b2 (Pfizer-BioNTech) vaccine shows approximately 39% of solid cancer patients, 13% of hematological cancer patients, and 97% of healthy controls (p<0.0001) developed anti-S IgG 21 days following a single dose vaccine. However, response in solid cancer patients increased to 95% within 2 weeks of the second dose at 21 days.
oOther immunocompromising conditions (e.g., auto-immune disorders and therapy): some level of immunity is generated with vaccination; however, what this means clinically is unknown. It seems that ensuring the dosing is properly timed around biologic therapy is important.
Azizian, A; Lee, S; Shumilak, G; Groot, G; Reeder, B; Miller, L; Howell-Spooner, B. What are the risks or benefits of extended intervals between doses of COVID-19 vaccines compared to recommended dosing in extremely vulnerable populations? 2021 Apr 20, Document no.: EOC210302 RR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2021. 15 p. (CEST rapid review report).
Visitor restrictions in long-term care (LTC) during an outbreak or pandemic are implemented due to the perceived risk of transmission between residents or staff and visitors.
· Social isolation and possible loss of care resulting from visitor restrictions in LTC may place residents at risk of poorer outcomes in terms of both physical and mental health, as well as distress to families and staff (see Saskatchewan LTC Network Family Perspective).
· Visitor restriction policies typically allow visits for compassionate reasons that include end of life, critical care, and support of persons who require assistance beyond that provided by healthcare e.g. support for feeding, mobility, or behaviors, but specific detail on these is not consistent or clear.
· Recent changes to visitation policies in Australia are less restrictive and allow brief visitations (end of table 1, noted in red font).
· Although the majority of policies describe a need for flexibility and case-by-case assessment of visits deemed “essential”, the majority of policies are not clear in who is to conduct this analysis or the criteria that should be used to make these decisions.
Visitation policies differ in detail regarding the number of visitors allowed at one time, total number of visitors allowed, visit duration, mobility within the home and location of the visit.
· Remote and technology assisted visits are to be facilitated by LTC staff.
· Infection control practices are enforced for visitors, and may include screening (e.g. temperature, symptoms, travel and contact history), prohibiting ill visitors, use of personal protective equipment (PPE), hand and cough hygiene.
· Education of visitors and support for proper infection control practices is encouraged in the majority of policies.
Tupper, S; Ward, H; Howell-Spooner, B; Dalidowicz, M; Boden, C. How is "compassionate visit" defined and operationalized in the context of an infectious outbreak or pandemic in long-term care? 2020 May 1; Document no.: LTC042402
RR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2020. 17 p. (CEST rapid review report)