Past SARS-CoV-2 infection elicits a strong immune response after a single vaccine dose

We hypothesized that in individuals with previous SARS-CoV-2 infection, the first vaccine dose would work as a booster, eliciting a faster and more intense immune response. We herein describe antibody responses to the first and second doses of Gam-COVID-Vac (SPUTNIK V) vaccine in health personnel of Tucuman, Argentina, with previous COVID-19 and compared it with uninfected personnel. Individuals with anti-SARS-CoV-2 titers at baseline showed significantly higher responses to the first dose than people with no prior history of disease (p <0.0001), with titers higher to those registered after the second dose in the control group, representing a clear secondary antibody response. This suggests that a single dose of SPUTNIK V for people with previous SARS-CoV-2 infection could contribute to a better use of available doses.

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Vaccination strategy and anti - SARS-CoV-2 S titers in healthcare workers of the INT – IRCCS “Fondazione Pascale” Cancer Center (Naples, Italy)

Infectious Agents and Cancer ◽

10.1186/s13027-021-00375-2 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Ernesta Cavalcanti ◽

Maria Antonietta Isgrò ◽

Domenica Rea ◽

Lucia Di Capua ◽

Giusy Trillò ◽

...

Keyword(s):

Immune Response ◽

Immune Responses ◽

Healthcare Workers ◽

Geometric Mean ◽

Vaccination Strategy ◽

Antibody Responses ◽

Cancer Center ◽

Serum Samples ◽

Humoral Immune ◽

History Of

Abstract Background Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection and the resulting disease, coronavirus disease 2019 (COVID-19), have spread to millions of people globally, requiring the development of billions of different vaccine doses. The SARS-CoV-2 spike mRNA vaccine (named BNT162b2/Pfizer), authorized by the FDA, has shown high efficacy in preventing SARS-CoV-2 infection after administration of two doses in individuals 16 years of age and older. In the present study, we retrospectively evaluated the differences in the SARS-CoV-2 humoral immune response after vaccine administration in the two different cohorts of workers at the INT - IRCCS “Fondazione Pascale” Cancer Center (Naples, Italy): previously infected to SARS-CoV-2 subjects and not infected to SARS-CoV-2 subjects. Methods We determined specific anti-RBD (receptor-binding domain) titers against trimeric spike glycoprotein (S) of SARS-CoV-2 by Roche Elecsys Anti-SARS-CoV-2 S immunoassay in serum samples of 35 healthcare workers with a previous documented history of SARS-CoV-2 infection and 158 healthcare workers without, after 1 and 2 doses of vaccine, respectively. Moreover, geometric mean titers and relative fold changes (FC) were calculated. Results Both previously infected and not infected to SARS-CoV-2 subjects developed significant immune responses to SARS-CoV-2 after the administration of 1 and 2 doses of vaccine, respectively. Anti-S antibody responses to the first dose of vaccine were significantly higher in previously SARS-CoV-2-infected subjects in comparison to titers of not infected subjects after the first as well as the second dose of vaccine. Fold changes for subjects previously infected to SARS-CoV-2 was very modest, given the high basal antibody titer, as well as the upper limit of 2500.0 BAU/mL imposed by the Roche methods. Conversely, for naïve subjects, mean fold change following the first dose was low ($$ \overline{x} $$ x ¯ =1.6), reaching 3.8 FC in 72 subjects (45.6%) following the second dose. Conclusions The results showed that, as early as the first dose, SARS-CoV-2-infected individuals developed a remarkable and statistically significant immune response in comparison to those who did not contract the virus previously, suggesting the possibility of administering only one dose in previously SARS-CoV-2-infected subjects. FC for previously infected subjects should not be taken into account for the generally high pre-vaccination values. Conversely, FC for not infected subjects, after the second dose, were = 3.8 in > 45.0% of vaccinees, and ≤ 3.1 in 19.0%, the latter showing a potential susceptibility to further SARS-CoV-2 infection.

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Abstract 18516: Regional Dysfunction of Left Atrial Appendage and its Association with Stroke in Atrial Fibrillation

Circulation ◽

10.1161/circ.130.suppl_2.18516 ◽

2014 ◽

Vol 130 (suppl_2) ◽

Author(s):

Abdullah A Alissa ◽

Yuko Inoue ◽

Jochen Cammin ◽

Qiulin Tang ◽

Elliot Fishman ◽

...

Keyword(s):

Atrial Fibrillation ◽

Left Atrial ◽

Left Atrial Appendage ◽

Atrial Appendage ◽

Control Group ◽

Prior History ◽

Area Change ◽

Increased Risk ◽

History Of ◽

Regional Dysfunction

Background: Atrial Fibrillation (AF) is associated with an increased risk of cardioembolic stroke. Previous studies demonstrate that the Left atrial appendage (LAA) is the most common site of intracardiac thrombus, and the LAA morphology alone may determine the risk of stroke. We aimed to determine the association between LAA regional dysfunction using novel, noninvasive, image-based motion-estimation CT (iME) and prior history of stroke in patients with AF. Methods: Among the patients with history of AF referred for ablation who underwent pre-ablation CT with retrospective ECG gating, we identified 18 patients with a prior history of stroke or TIA, and 18 age- and gender-matched controls. The patients in AF at the time of CT were excluded. Four-dimensional motion vector field was estimated from reconstructed CT images using iME at every 5% RR interval. To assess myocardial deformation, area change ratio and area change rate were calculated over the endocardial surface of the LA and LAA. Univariate and multivariate comparisons were made by using binary logistic regression model. Results: A total of 36 patients (mean age 67.6 ± 8.1 years, 66.7% male, 16.7% persistent AF) were included in the study. Univariate analysis showed that the LA pre-atrial contraction area change ratio and LAA maximum area change ratio were significantly lower (P= 0.02 and 0.04, respectively) in the stroke/TIA group compared to the control group. These changes remained statistically significant in multivariate analysis (P=0.03 and 0.04, respectively) after adjusting for age, sex, body mass index, LV ejection fraction, type of AF, and CHADS score. Conclusions: LAA regional dysfunction is associated with stroke/TIA in patients with AF. LAA regional dysfunction detected by iME could represent a marker for stroke and a possible therapeutic target.

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The Investigation of Tramadol Dependence with No History of Substance Abuse: A Cross-Sectional Survey of Spontaneously Reported Cases in Guangzhou City, China

BioMed Research International ◽

10.1155/2013/283425 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 10

Author(s):

Haoran Zhang ◽

Zhimin Liu

Keyword(s):

Substance Abuse ◽

Physical Dependence ◽

Abuse Potential ◽

Opiate Withdrawal ◽

Control Group ◽

Prior History ◽

Cross Sectional Survey ◽

Cross Sectional ◽

Healthy Men ◽

History Of

The study was to survey and assess the drug dependence and abuse potential of tramadol with no history of substance abuse. Subjects of tramadol dependence with no prior history of substance abuse were surveyed by interview. Physical dependence of tramadol was assessed using 10 items opiate withdrawal scale (OWS), and psychological dependence was assessed by Addiction Research Center Inventory—Chinese Version (ARCI-CV). Twenty-three male subjects (the median age was23.4±4.1years) referred to the addiction unit in Medical Hospital of Guangzhou with tramadol abuse problems were included in this cross-sectional study. The control group included 87 heroin addicts, 60 methamphetamine (MA) abusers, and 50 healthy men. The scores of OWS of tramadol were 0.83–2.30; the mean scores of identifying euphoric effects–MBG, sedative effects–PCAG, and psychotomimetic effects–LSD of ARCI were8.96±3.08,6.52±3.25, and6.65±2.50, respectively,F= 4.927,P<0.001. Scores of MBG scale in tramadol did not differ from those in heroin and MA groups (P>0.05) but were higher than those in healthy men (P<0.05). Tramadol with no history of substance abuse has a clear risk of producing high abuse potential under the long-term infrequent abuse and the high doses.

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THE NATURE OF THE IMMUNOLOGIC INADEQUACY OF NEONATAL RABBITS AS REVEALED BY CELL TRANSFER STUDIES

Journal of Experimental Medicine ◽

10.1084/jem.105.1.75 ◽

1957 ◽

Vol 105 (1) ◽

pp. 75-83 ◽

Cited By ~ 40

Author(s):

Frank J. Dixon ◽

William O. Weigle

Keyword(s):

Immune Response ◽

Lymph Node ◽

Antibody Formation ◽

Antibody Responses ◽

Cell Transfer ◽

Secondary Antibody ◽

Internal Environment ◽

Antibody Synthesis ◽

Lymph Node Cells ◽

Early Phases

Lymph node cells capable of either primary or secondary antibody responses following transfer to adult normal or x-radiated homologous recipients make no response following transfer to neonatal homologous recipients. On the basis of the present observations it seems that the environment provided by the neonatal recipient is unsuitable for the immunologic activities of transferred cells in the early phases of the immune response. Neonatal recipients can, however, adequately support cells transferred during the process of active antibody formation. These findings suggest that the immunologic inadequacy of the neonatal animal is related to its internal environment and not necessarily to the lack of cells capable of antibody synthesis.

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Robust immune responses after one dose of BNT162b2 mRNA vaccine dose in SARS-CoV-2 experienced individuals

10.1101/2021.02.07.21251311 ◽

2021 ◽

Cited By ~ 7

Author(s):

Marie I. Samanovic ◽

Amber R. Cornelius ◽

Sophie L. Gray-Gaillard ◽

Joseph Richard Allen ◽

Trishala Karmacharya ◽

...

Keyword(s):

Immune Responses ◽

Protective Efficacy ◽

Vaccine Dose ◽

Prior History ◽

Vaccine Candidates ◽

Antibody Secreting Cell ◽

Cell Responses ◽

Efficacy Trials ◽

History Of ◽

Humoral Responses

ABSTRACTThe use of COVID-19 vaccines will play a major role in helping to end the pandemic that has killed millions worldwide. COVID-19 vaccine candidates have resulted in robust humoral responses and protective efficacy in human trials, but efficacy trials excluded individuals with prior diagnosis of COVID-19. As a result, little is known about how immune responses induced by mRNA vaccine candidates differ in individuals who recovered from COVID-19. Here, we evaluated longitudinal immune responses to two-dose BNT162b2 mRNA vaccination in 13 adults who recovered from COVID-19, compared to 19 adults who did not have prior COVID-19 diagnosis. Consistent with prior studies of mRNA vaccines, we observed robust cytotoxic CD8 T cell responses in both cohorts. Furthermore, SARS-CoV-2-naive individuals had progressive increases in humoral and antigen-specific antibody-secreting cell (ASC) responses following each dose of vaccine, whereas SARS-CoV-2-experienced individuals demonstrated strong humoral and antigen-specific ASC responses to the first dose but muted responses to the second dose of the vaccine for the time points studied. Together, these data highlight the relevance of immunological history for understanding vaccine immune responses and may have significant implications for personalizing mRNA vaccination regimens used to prevent COVID-19.One Sentence SummaryPrior history of COVID-19 affects adaptive immune responses to mRNA vaccination.

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Immunostimulant Activity of Marchantia paleacea Bertol. Herb Liverwort Ethanol Extract in BALB/c Mice

INDONESIAN JOURNAL OF PHARMACY ◽

10.22146/ijp.2128 ◽

2021 ◽

pp. 464-473

Author(s):

Dicki Bakhtiar Purkon

Keyword(s):

Immune Response ◽

Antibody Titer ◽

Ethanol Extract ◽

Delayed Type Hypersensitivity ◽

Phagocytic Index ◽

Control Group ◽

Specific Response ◽

Secondary Antibody ◽

Phytochemical Screening ◽

Marchantia Paleacea

Immunostimulants are compounds that can stimulate an immune response by increasing the activity of non-specific and specific components of the immune system (humoral and cellular) against certain infections and diseases. The liverwort plant species Marchantia paleacea Bertol. has long been used as a source of nutrition and empirical medicine. However, scientifically there is still not much research data on immunomodulators in these plants. This study aims to determine the activity of immunomodulators in the ethanol extract of the herb Marchantia paleacea Bertol. in male mice of BALB/c strain. Bioactive compounds from this plant were extracted by maceration method using 96% ethanol. Extract characterization and phytochemical screening were determined according to WHO guidelines and standard procedures from previous studies. The immunomodulatory activity of the extract was tested by carbon clearance method and lymphoid organ index (non-specific responses), primary and secondary antibody titer tests (humoral specific responses), IL-2 cytokine levels and IFN-ɣ from serum secondary antibodies and delayed-type hypersensitivity reaction/DTH (cellular specific response). The results of qualitative phytochemical screening contained flavonoid compounds, saponins, phenolics, tannins and steroids/triterpenoids. The results of the non-specific immune response immunomodulator test showed that the dose of 52 mg/kg bw had the largest phagocytic index of 1.52 which included strong immunostimulation (K > 1.5) and the organ spleen index of 0.55 ± 0.11 which increased significantly compared to the control (p<0.05). The data on the acquisition of specific immune responses in the primary and secondary antibody titer test in the three test extracts resulted in increased titer levels compared to the control and at a dose of 52 mg/kg bw could significantly increase the levels of IL-2 cytokines in the control group (p<0,05). Meanwhile, in the DTH test, doses of 13 and 26 mg/kg bw could significantly increase the thickness of the soles of mice compared to controls (p<0.05).

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Immunity Reduces Reservoir Host Competence of Peromyscus leucopus forEhrlichia phagocytophila

Infection and Immunity ◽

10.1128/iai.68.3.1514-1518.2000 ◽

2000 ◽

Vol 68 (3) ◽

pp. 1514-1518 ◽

Cited By ~ 35

Author(s):

Michael L. Levin ◽

Durland Fish

Keyword(s):

Immune Response ◽

Ixodes Scapularis ◽

Early Summer ◽

Reservoir Host ◽

Single Infection ◽

Control Group ◽

Strong Immune Response ◽

Mouse Population ◽

Ehrlichia Phagocytophila ◽

Host Competence

ABSTRACT Infection with Ehrlichia phagocytophila in white-footed mice is transient and followed by a strong immune response. We investigated whether the presence of acquired immunity against E. phagocytophila precludes white-footed mice from further maintenance of this agent in nature. Mice were infected withE. phagocytophila via tick bite and challenged either 12 or 16 weeks later by Ixodes scapularis nymphs infected with the same agent. Xenodiagnostic larvae fed upon each mouse simultaneously with challenging nymphs and 1 week thereafter. Ticks were tested for the agent by PCR, and the prevalence of infection was compared to that in ticks that fed upon nonimmune control mice. Only 30% of immunized mice sustained cofeeding transmission of E. phagocytophila between simultaneously feeding infected and uninfected ticks, compared to 100% of control mice. An average of 6.3% of xenodiagnostic ticks acquired Ehrlichia from previously immunized mice when fed 1 week after the challenge, compared to 82.5% infection in the control group. Although an immune response to a single infection with E. phagocytophila in white-footed mice provided only partial protection against reinfection with the same agent, the majority of mice were rendered reservoir incompetent for at least 12 to 16 weeks. Immunity acquired by mice during I. scapularis nymphal activity in early summer may exclude a large proportion of the mouse population from maintainingE. phagocytophila during the period of larval activity later in the season.

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Lower weight gain after vaping cessation than after smoking quitting

Roczniki Państwowego Zakładu Higieny ◽

10.32394/rpzh.2019.0075 ◽

2019 ◽

pp. 253-258

Author(s):

Ewelina Wawryk-Gawda ◽

Michał K. Zarobkiewicz ◽

Patrycja Chylińska-Wrzos ◽

Barbara Jodłowska-Jędrych

Keyword(s):

Weight Gain ◽

Electronic Cigarettes ◽

Mass Gain ◽

The Body ◽

Control Group ◽

Prior History ◽

History Of ◽

Group A ◽

Lower Weight Gain ◽

Group B

Background. Smoking is frequently a way to control appetite and weight. The data concerning the body mass gain after quitting among the users of electronic cigarettes who have no prior history of smoking traditional cigarettes is inconsistent. Objective. In our study we have compared smoking and vaping impact on weight gain and glycaemia. Material and methods. 3 groups of rats were used. The group A was exposed to vapour and group B were exposed to smoke. Rats in the group C constituted the control group without nicotine exposition. Results. During 6 weeks of experiment weight gain of rats in the A and B groups was comparable, while animals from group C had gained signifi0cantly more. During 2 weeks after cessation of exposition to nicotine animals from group B gained more weight than rats of A and C group. Blood glucose was higher in group B than in groups A and C 24 h after last exposure to nicotine and 2 weeks after nicotine exposure cessation. Conclusion. Effects of vaping on weight increase is similar to smoking, but after vaping cassation weight gain is lower and comparable with nicotine nonusers.

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Humoral immune response in beef heifers supplemented with mineral salt with or without the addition of rumen-protected methionine

Semina Ciências Agrárias ◽

10.5433/1679-0359.2019v40n6supl2p3057 ◽

2019 ◽

Vol 40 (6Supl2) ◽

pp. 3057

Author(s):

Matheus Gomes Lopes ◽

José Henrique Echenique Dominguez ◽

Cristina Mendes Peter ◽

Ederson Santos ◽

Paula Almeida Rodrigues ◽

...

Keyword(s):

Immune Response ◽

Treatment Group ◽

Humoral Immune Response ◽

Vaccine Dose ◽

Daily Weight Gain ◽

Control Group ◽

Beef Heifers ◽

Blood Samples ◽

Humoral Immune ◽

Mineral Supplementation

The aim of this study was to evaluate the humoral immune response in beef heifers supplemented with mineral supplementation with or without the addition of rumen-protected methionine. Forty-eight Brangus nulliparous heifers were distributed into four experimental groups with three replications each: control group without supplementation and without vaccination (CG01), control group without supplementation and with vaccination (CG02), treatment group with mineral supplementation and vaccination (TG01), and treatment group with mineral supplementation added with protected methionine and vaccination (TG02). The animals were maintained under native pasture with access to water ad libitum and the supplementation was available in high-consumption covered troughs. A supplementation period of 60 days prior to vaccinations was adopted until the first dose of a monovalent experimental vaccine inactivated for BoHV-5 was applied as a method of stimulating the immune response to evaluate the supplementation effects. After a 21-day interval, blood samples were collected to evaluate the humoral response and the second vaccine booster dose was applied following the 21-day interval for new blood samples in order to evaluate the immune response against the two-vaccination protocol. From the beginning of the experiment, the animals were weighed on the days ?60, ?10, 0, 21, and 42 in relation to the vaccine protocol. The experimental groups did not differ for body weight, mean daily weight gain, and body condition score after 102 days of supplementation regardless of the treatment. No animals belonging to CG01 seroconverted throughout the experiment, proving that there was no introduction of the agent (BoHV) in the studied area. When vaccinated animals were compared to the CG01 control group, statistically higher levels of neutralizing antibodies (P ? 0.0001) and IgG (P ? 0.0001) were verified 21 days after the second vaccine dose. Among the animals of the three vaccinated groups, there was no difference in seroconversion and IgG production. Therefore, no benefits of mineral supplementation or enriched with protected methionine were observed for the humoral immune response of the studied animals.

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Antibody responses to BNT162b2 mRNA vaccine: infection-naive individuals with abdominal obesity warrant attention

10.1101/2021.09.10.21262710 ◽

2021 ◽

Author(s):

ALEXIS ELIAS MALAVAZOS ◽

Sara Basilico ◽

Gianluca Iacobellis ◽

Valentina Milani ◽

Rosanna Cardani ◽

...

Keyword(s):

Immune Response ◽

Abdominal Obesity ◽

Neutralizing Antibodies ◽

Vaccine Dose ◽

Antibody Responses ◽

Time Points ◽

Trimeric Complex ◽

Antibody Levels ◽

Visceral Adipose ◽

Prior Infection

Objective. The excess of visceral adipose tissue might hinder and delay the immune response. How people with abdominal obesity will respond to mRNA vaccines against SARS-CoV-2 is yet to be established. We evaluated SARS-CoV-2-specific antibody responses after the first and second dose of the BNT162b2 mRNA vaccine comparing the response of individuals affected by abdominal obesity (AO) to those without, discerning between individuals with or without prior infection. Methods. IgG neutralizing antibodies against the Trimeric complex (IgG-TrimericS) were measured at four time points: at baseline, at day 21 after vaccine dose-1, at one month and three months after dose-2. Nucleocapsid antibodies were assessed to detect prior SARS-CoV-2 infection. Waist circumference was measured to determine abdominal obesity. Results. Between the first and third month after vaccine dose-2, the drop in IgG-TrimericS levels was more remarkable in individuals with AO compared to those without AO (2.44 fold [95%CI: 2.22-2.63] vs 1.82 fold [95%CI: 1.69-1.92], respectively, p<0.001). Multiple linear regression confirmed this result even when adjusting for possible confounders (p<0.001). Conclusions. Our findings highlight the need to extend the duration of serological monitoring of antibody levels in infection-naive individuals with abdominal obesity, a higher-risk population category in terms of possible weaker antibody response.

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