ABSTRACT
Background: Risankizumab (RZB), a p19-anti-interleukin-23 monoclonal antibody, has demonstrated efficacy as induction and maintenance therapy in patients with moderately to severely active Crohn's disease (CD). This post hoc analysis evaluates the efficacy of induction and maintenance RZB therapy by baseline clinical, biochemical, and endoscopic disease severity. Method(s): In the ADVANCE (NCT03105128) and MOTIVATE (NCT03104413) studies, patients with moderately to severely active CD and intolerance/inadequate response to >= 1 biologic (both studies) and/or conventional therapy (ADVANCE) were randomized to receive intravenous (IV) RZB induction therapy or placebo (PBO) for 12 weeks. Patients achieving stool frequency and/or abdominal pain score clinical response to 12 weeks of induction therapy were rerandomized in the FORTIFY (NCT03105102) study to receive subcutaneous (SC) maintenance RZB (180 mg or 360 mg) or PBO (withdrawal). Clinical and endoscopic endpoints were evaluated by baseline disease characteristics (Crohn's Disease Activity Index [CDAI: <= 300, > 300], highsensitivity C-reactive protein [hs-CRP: < 10 mg/L, >= 10 mg/L], and Simple Endoscopic Score for Crohn's Disease [SES-CD: 6-15, > 15]). Induction analyses included patients who received RZB 600 mg or PBO;data from the ADVANCE and MOTIVATE studies were pooled. Nonresponder imputation incorporating multiple imputation to handle missing data due to COVID-19 was used. Result(s): The induction analysis included 527 patients who received RZB 600 mg IV and 362 patients who received PBO. Patients treated with RZB 600 mg IV achieved significantly higher response rates vs PBO at week 12, regardless of subgroup (P < .05 for all;Figure 1). In the maintenance study, patients treated with SC RZB continued to achieve higher response rates vs the PBO (withdrawal) group at week 52 regardless of subgroup (P was not < .05 for all;Figure 2). Improvements in clinical and endoscopic outcomes were generally observed from weeks 12 to 52 with RZB treatment across all subgroups. Response rates were generally similar across subgroups in both induction and maintenance studies;endoscopic remission and ulcer-free endoscopy (resolution of ulcer) rates were numerically lower for patients with increased inflammation (hs-CRP > 10 mg/mL) and higher endoscopic activity (SES-CD > 15). Conclusion(s): RZB induction therapy resulted in higher response rates for clinical and endoscopic outcomes compared with PBO at week 12, regardless of baseline clinical, biochemical, and endoscopic disease severity. RZB also showed durable efficacy with continued RZB maintenance therapy, supporting the long-term use of RZB for patients across a range of baseline disease severity and activity.
ABSTRACT
Background: The efficacy and safety of risankizumab (RZB) in patients with Crohn's disease (CD) has been demonstrated.1,2 We reported that an additional 12 weeks (ie, induction period 2) of RZB therapy could induce clinical response in patients with CD who did not achieve clinical response after an initial 12-week induction period.3 In this post hoc analysis, we report the proportion of patients who achieved clinical response over 24 weeks (initial and delayed responders to RZB induction therapy). Method(s): Data were pooled from the ADVANCE and MOTIVATE phase 3 RZB studies. Patients who had not achieved stool frequency (SF)/abdominal pain score (APS) clinical response (>= 30% decrease in average daily SF and/or >= 30% decrease in average daily APS and both not worse than baseline) after an initial 12-week induction with intravenous (IV) RZB (600 mg or 1200 mg) at weeks 0, 4, and 8 were rerandomized 1:1:1 in induction period 2 to receive IV RZB 1200 mg (at weeks 12, 16, and 20) or subcutaneous (SC) RZB (180 mg or 360 mg at weeks 12 and 20) in a double-dummy-blinded fashion. In this post hoc analysis, efficacy was analysed in patients treated with either 600 mg RZB IV or placebo (PBO) for 12 weeks in the PBO-controlled induction period and patients who did not achieve clinical response with 600 mg RZB IV for 12 weeks and were rerandomized to 360 mg RZB SC every 8 weeks during induction period 2 (currently marketed RZB doses). SF/ APS clinical response was assessed at week 12 for initial responders and at week 24 for delayed responders in induction period 2. Nonresponder imputation with no special data handling for data missing due to COVID-19 was used. No multiplicity adjustment was performed. Result(s): Of the 889 patients randomised to 600 mg IV RZB or PBO in the induction studies, 70.0% (369/527) in the RZB group compared with 45.6% (165/362) in the PBO group achieved SF/APS clinical response at week 12. Of the 47 patients who did not achieve initial clinical response to 600 mg IV RZB and received 360 mg SC in induction period 2, 32 (68.1%) achieved delayed SF/APS clinical response at week 24. The proportion of patients achieving SF/APS clinical response over 24 weeks (either initial or delayed responders) was 89.1% (401/450). The safety profile of RZB in patients with CD has been reported.1,2 Conclusion(s): In patients with moderate-to-severe CD, RZB treatment leads to approximately 9 of 10 patients achieving either initial (600 mg IV) or delayed (600 mg IV followed by 360 mg SC) clinical response over 24 weeks.
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Background: Targeted Immune-Modulating Therapies (TIMT) and immunomodulators (IMM) for Immune Mediated Inflammatory diseases (IMID) theoretically interfere with humoral responses against COVID19. However, IMID patients and particularly patients receiving immunosuppressive treatment were excluded from phase-3 COVID19 vaccination efficacy trials. Real-world observational data is therefore required to provide more insight into the efficacy of COVID19 vaccination in IMID patients. Method(s): The BELCOMID study is a multidisciplinary, prospective observational cohort study performed at two university hospitals and set up with the intention to explore the interaction between IMIDs, immune-modulating treatment modalities and SARS-CoV-2 infection and vaccination in a real-life patient cohort. Consecutive patients seen between 17/12/2020 and 28/02/2021 during routine follow-up for IMIDs of the gut, joints and skin were invited to participate. Both patient data and serological samples were collected at 3 predefined periods (Figure 1: Before vaccination, after start of the national vaccination campaign before booster vaccination, after booster vaccination). Spike (S) protein antibodies were analysed with the Abbott ArchitectTM assay. R version 4.0.2 was used to perform analyses. Result(s): At inclusion period 2, 2065 patients (Table 1) participated of whom 1547 had received complete baseline vaccination (2 doses mRNA-1273, BNT162b2, ChadOx1 nCoV-19 or 1 dose JN78436735). S-antibody seroconversion rate was 91.2%. At inclusion period 3, data was available for 1566 patients of whom 74.7% had received 1 booster (BNT162b2 or mRNA-1273) vaccination leading to a S-antibody seroconversion rate of 98.3%. In 130 patients who had received 2 boosters, S-antibody seroconversion rate was 100%. At period 3, 37 patients had refused all vaccinations. Although 23 of these had experienced confirmed COVID19 since previous inquiry, no S-antibody seroconversion was found in 15 of them. Logistic regression analyses revealed that the odds of no S-antibody seroconversion were significantly higher in IMID patients treated with IMM, combination of IMM+TIMT, systemic steroids and smoking patients at both inclusion periods (Table 2). TIMT monotherapy did not influence seroconversion rates at inclusion period 3 but was associated with higher odds of the lowest S-antibody titre quartile (OR2.32, P<0.001). Among TIMT options, rituximab had higher odds of S-seronegativity. Conclusion(s): S-antibody seroconversion rate in this real-life IMID population was high after baseline vaccination and increased further proportionally with booster vaccination, highlighting the value of repeated vaccination. However, the serologic response may be blunted due to different IMID treatment modalities and smoking.
ABSTRACT
Background: Patients with immune-mediated infammatory diseases (IMID) are at higher risk for infectious diseases. Despite this increased risk and the available guidelines1,2, we reported a suboptimal vaccination rate of 27 % of IMID patients in 2018. In the meantime, a vaccination module was introduced in the electronic patient medical record (EMR) of our hospital to accurately document and monitor vaccination status of patients. Objectives: To evaluate the impact of a new vaccination module in the patient health record on vaccination coverage in a previously included IMID cohort. Methods: Between Aug and Oct 2021, the vaccination status of 1435 (out of the original 1488) IMID patients (45 % male, median age 53.6 years) was collected (790 patients with IBD (infammatory bowel diseases), 607 with rheumatologic infammatory conditions (RHEU)(RA or SpA), and 38 with dermatologic infam-matory conditions(DER)) and was compared to that of 2018. The vaccination status for infuenza (FLU), pneumococci (Pnc), hepatitis B (Hep B) and tetanus (TT) was obtained mainly through the patients' electronic medical records. Missing data were added after contacting patients or their general practitioner. Results: From 2018 to 2021, the overall vaccination coverage (excluding TT) of all IMID patients signifcantly increased from 42 % to 66 % (p<0.001, Figure 1). For patients with RHEU, the vaccination coverage signifcantly increased, namely from 69.0% to 75 % for FLU (p<0.001), from 36 % to 89 % for Pnc (p<0.001), from 57 % to 73 % for Hep B (p<0.001) and from 34 % to 74 % overall (p=0.008) (Figure 1 and Table 1). Similarly, the vaccination coverage in IBD patients increased signifcantly from 76 % to 87 % for FLU (p<0.001), from 73 % to 82 % for Pnc (p<0.001), from 67 % to 79 % for Hep B (p<0.001) and from 47 % to 61 % overall (p<0.001) (Figure 1 and Table 1). For patients with DER, vaccination coverage signifcantly increased from 47 % to 65 % for Hep B (p<0.001) (Table 1). TT vaccination coverage decreased in all 3 IMID groups from 2018 to 2021. Conclusion: The implementation of a vaccination tool integrated in the EMR coincided with a signifcant increase in vaccination rates and also in the total amount of IMID patients that were fully vaccinated according to guidelines. Quite likely, the suboptimal vaccination rate measured in 2018 and the COVID-19 pandemic also raised awareness among patients and healthcare professionals about the importance of following vaccination guidelines.
ABSTRACT
Background: An association between shorter disease duration and improved clinical efficacy has been shown in post hoc analyses of clinical trial data with biological therapies in Crohn’s disease (CD). The efficacy and safety of risankizumab (RZB) as induction and maintenance therapy have been recently reported.1,2 Here, the efficacy of RZB stratified by baseline CD duration is reported. Methods: In ADVANCE (NCT03105128) and MOTIVATE (NCT03104413), patients with moderately to severely active CD received intravenous (IV) RZB induction therapy or placebo (PBO) for 12 weeks. Patients with clinical response to RZB IV induction were re-randomised in a 52-week maintenance study (FORTIFY NCT03105102) to receive subcutaneous (SC) RZB or PBO (ie, withdrawal). For this posthoc analysis, patient subgroups were stratified by years of CD duration at baseline (< 2, 2– 5, > 5–10, and > 10 years). Induction analyses focused on patients who received RZB 600 mg IV or PBO for 12 weeks. As all patients who entered maintenance responded to RZB IV induction, maintenance analyses were limited to those patients who responded to induction and then received RZB 360 mg SC for 52 weeks. Clinical and endoscopic outcomes were evaluated using nonresponder imputation incorporating multiple imputation to handle missing data due to impact of the COVID-19 pandemic. Safety was assessed throughout the studies. Results: The induction and maintenance analyses included 527 patients who received RZB 600 mg IV and 141 patients who received RZB 360 mg SC, respectively. At the end of induction (week 12), patients with CD duration of < 2 years achieved higher rates of endoscopic outcomes with IV RZB induction vs patients with longer durations of disease (Figure 1), and regardless of baseline CD duration, greater proportions of RZB-treated patients achieved clinical remission (defined by stool frequency and abdominal pain), endoscopic response, endoscopic remission, and ulcer-free endoscopy vs PBO (P ≤ .05). Clinical remission rates at week 12 were numerically higher in patients with CD duration of < 5 years vs > 5 years (Figure 1). Similar results for improved clinical and endoscopic outcomes associated with shorter disease duration were observed at week 52 with RZB 360 mg SC maintenance treatment (Figure 2). RZB was well tolerated with lower rates of serious adverse events and serious infections vs PBO in induction, across CD duration subgroups. Conclusions: RZB induction and maintenance therapy was effective and well tolerated with a safety profile generally similar across CD duration subgroups. Achievement of clinical and endoscopic endpoints were higher in patients with shorter duration of CD, suggesting that earlier introduction of RZB therapy may lead to improved outcomes.
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Background Patients with immune-mediated inflammatory diseases (IMID) are at higher risk for infectious diseases. Despite this increased risk and the available guidelines1, we reported a suboptimal vaccination rate of 33.8% of IMID patients in 2018. In the meantime, a vaccination module was introduced in the electronic patient health record of our hospital to accurately document and monitor vaccination status of patients. The impact of this new module on vaccination coverage was re-evaluated in the same IMID patients in 2021. Methods Between Aug and Oct 2021, the vaccination status of 1448 (out of the original 1488) IMID patients (44.8% male, median age 53.6 years) was collected (798 patients with IBD, 612 with rheumatological, and 38 with dermatological inflammatory conditions) and compared to that of 2018. The vaccination status was obtained mainly through the patients' electronic medical records. Missing data were added after contacting patients or their general practitioner. Results From 2018 to 2021, the overall vaccination coverage of all IMID patients significantly increased from 33.8% to 51.1% (p<0.001, Figure 1). The vaccination coverage in IBD patients increased significantly from 75.9% to 86.3% for influenza (p<0.001), from 72.9% to 88.7% for pneumococci (p<0.001), from 66.0% to 80.2% for hepatitis B (p<0.001), from 79.9% to 85.7% for tetanus (p=0.041) and from 42.2% to 60.4% overall (p<0.001) (Figure 1 and Table 1). Similarly, the vaccination coverage significantly increased for rheumatology patients, namely from 69.3% to 78.3% for influenza (p<0.001), from 34.5% to 85.0% for pneumococci (p<0.001) and from 32.8% to 36.5% for hepatitis B (p<0.001) (Table 1). For patients with dermatological inflammatory conditions, vaccination coverage significantly increased from 60.5% to 81.6% for pneumococci (p=0.031) and from 47.1% to 55.3% for hepatitis B (p=0.002) (Table 1). Conclusion The suboptimal vaccination rate measured in 2018 and the COVID-19 pandemic stressed the importance of vaccination recommendations to patients and healthcare professionals. We here show that the implementation of a vaccination tool integrated in the electronic medical record of patients is correlated with a significant increase in specific vaccination rates and also in the total amount of IMID patients that were fully vaccinated according to guidelines. 1. Rahier JF, Magro F, Abreu C, et al. Second European evidence-based consensus on the prevention, diagnosis and management of opportunistic infections in inflammatory bowel disease. J Crohns Colitis. 2014;8:443–468.(Figure Presented)(Table Presented)
ABSTRACT
It was suggested that all SARS-CoV2 infections lead to development of specific IgG antibodies that remain detectable in time. Targeted Immune-Modulating Therapies (TIMT) for treatment of Immune Mediated Inflammatory diseases (IMID) could interfere with humoral immune response against COVID-19. To investigate the seroprevalence of SARS-CoV2 IgG in relation to previous exposure to COVID-19 and ongoing IMID treatment a cross-disciplinary, prospective observational cohort was set up at two Belgian university hospitals. Between 17/12/2020 and 28/02/2021, patients with IMIDs of the skin (psoriasis (PsO), hidradenitis suppurativa (HS), atopic dermatitis (AD)), gut or joints were asked to participate. Patients under conventional systemic treatment or TIMT were included. An electronic survey (REDCap®) and blood samples were obtained (SARS-CoV-2IgG Abbott–Architect kit®). Statistical analyses were performed with SPSS26. 2166 IMID patients consented to take part. 1913 completed the survey: 218 dermatology patients (77% PsO, 12% HS, 11% AD), 415 rheumatology and 1217 IBD patients. 372 patients (19.5%) reported having experienced symptoms suggestive of COVID-19: fatigue (61.3%) and headache (48.1%) were most frequent. 96 patients (5.04%) had a positive SARS-CoV2 PCR test on nasal or throat swab: in 45.8% anti-SARS-CoV2 IgG seroconversion was confirmed. There was no significant difference in seroconversion rate between the 2 treatment groups (P=0.192). Of the seroconverted group, 75.0% were treated with TIMT. Prevalence of COVID-19 symptoms and number of confirmed COVID-19 cases remain low in this IMID cohort, regardless of treatment modality. There was no significant difference in SARS- CoV2 IgG seroconversion rate between TIMT and conventional systemic treatment in patients with positive PCR.
ABSTRACT
Background: Immunomodulators (IMM) and Targeted Immune-Modulating Therapies (TIMT) such as anti-TNF, anti-interleukins and Janus Kinase inhibitors, for treatment of Immune Mediated Inflammatory diseases (IMID) could theoretically interfere with the cytokine storm and humoral immune response against COVID19 infection and vaccination. We investigate seroprevalence and evolution of SARS-CoV2 antibodies in relation to previous vaccination and/or exposure to COVID19 and ongoing IMID-treatment in a Belgian, reallife population of IMID patients. Methods: A cross-disciplinary, prospective, observational cohort study was set up at two university hospitals. All patients with IMIDs of the gut (Crohn's disease, ulcerative colitis), joints (rheumatoid, psoriatic or spondyloarthritis) and skin (psoriasis, hidradenitis suppurativa, atopic dermatitis) visiting the respective clinics were asked to participate. Patients had to fill out an electronic survey (REDCap®, based on WHO-ISARIC) and blood samples were drawn for serology testing (anti-Spike(S) and antiviral Nucleocapsid(N) protein antibody IgG, Abbott). Results at baseline, prior to the national vaccination program and at 6 months follow-up are presented. R version 4.0.2 was used for statistical analyses. Results: At baseline 2165 IMID patients consented to take part. In 3.2% SARS-CoV2 anti-N seroconversion was confirmed. Of the anti-N seroconverted patients 72.9% reported a positive PCR test prior to inclusion. At 6-months follow-up, data of 1853 IMID patients was collected. Of these, 81.7% were fully and 14.4% partially vaccinated. Seroconversion for anti-N antibodies was confirmed in 2.5% of all participants and seroconversion for anti-S antibodies in 90.8%. In 5.1% (61/1483) of fully vaccinated IMID patients no seroconversion in anti-N nor anti-S antibodies was found. Chi Square analyses show, at 6-months follow-up, no significant association between anti-S seroconversion rate and treatment with systemic steroids (RiskRatio 1.22, 95%CI 0.38-3.9, P=0.99), TIMT (RiskRatio 0.57, 95% CI 0.3-1.1, P=0.12), IMM (RiskRatio 1.65, 95% CI 0.85- 3.19, P=0.19) or combination treatment IMM/TIMT (RiskRatio 1.60, 95% CI 0.75-3.4, P=0.32). Appearance of COVID19 symptoms followed the epidemiological curve in Belgium (Fig1). Conclusion: In this real-life IMID cohort, the number of COVID19 cases confirmed by PCR prior to vaccination was low. Seroconversion rate for anti-N antibodies was lower at 6-months follow-up, suggesting decrease in antibody titre over time. Full COVID19 vaccination led to a high anti-S antibody seroconversion rate. Nonetheless, 5.1% of fully vaccinated patients showed no antibody seroconversion. So far, no significant association between anti-S antibody seroconversion and IMID treatment was noted.
ABSTRACT
Background: Patients with immune-mediated inflammatory diseases (IMID) are at higher risk for infectious diseases. Despite this increased risk and the available guidelines1, we reported a sub-optimal vaccination rate of 27.4% of IMID patients in 2018. In the meantime, a vaccination module was introduced in the electronic patient health record of our hospital to accurately document and monitor vaccination status of patients. The impact of this new module on vaccination coverage was re-evaluated in the same IMID patients in 2021. Methods: Between Aug and Oct 2021, the vaccination status of 1448 (out of the original 1488) IMID patients (44.8% male, median age 53.6 years) was collected (798 patients with IBD, 612 with rheumatological, and 38 with dermatological inflammatory conditions) and compared to that of 2018. The vaccination status was obtained mainly through the patients' electronic medical records. Missing data were added after contacting patients or their general practitioner. Results: From 2018 to 2021, the overall vaccination coverage of all IMID patients significantly increased from 27.4% to 51.9% (p<0.001, Figure 1). The vaccination coverage in IBD patients increased significantly from 75.9% to 86.3% for influenza (p<0.001), from 72.9% to 88.7% for pneumococci (p<0.001), from 66.0% to 80.2% for hepatitis B (p<0.001), from 79.9% to 85.7% for tetanus (p=0.041) and from 42.2% to 60.4% overall (p<0.001) (Figure 1 and Table 1). Similarly, the vaccination coverage significantly increased for rheumatology patients, namely from 69.3% to 78.3% for influenza (p<0.001), from 34.5% to 85.0% for pneumococci (p<0.001), from 32.8% to 36.5% for hepatitis B (p<0.001) and from 7.8% to 32.6% overall (p<0.001) (Figure 1 and Table 1). Conclusion: The suboptimal vaccination rate measured in 2018 and the COVID-19 pandemic stressed the importance of vaccination recommendations to patients and healthcare professionals. We here show that the implementation of a vaccination tool integrated in the electronic medical record of patients is correlated with a significant increase in specific vaccination rates and also in the total amount of IMID patients that were fully vaccinated according to guidelines.
ABSTRACT
Background: An association between shorter disease duration and improved clinical efficacy has been shown in post hoc analyses of clinical trial data with biological therapies in Crohn's disease (CD). The efficacy and safety of risankizumab (RZB) as induction and maintenance therapy have been recently reported. Here, the efficacy of RZB stratified by baseline CD duration is reported. Methods: In ADVANCE (NCT03105128) and MOTIVATE (NCT03104413), patients with moderately to severely active CD received intravenous (IV) RZB induction therapy or placebo (PBO) for 12 weeks. Patients with clinical response to RZB IV induction were re-randomised in a 52-week maintenance study (FORTIFY, NCT03105102) to receive subcutaneous (SC) RZB or PBO (ie, withdrawal). For this post-hoc analysis, patient subgroups were stratified by years of CD duration at baseline (< 2, 2-5, > 5-10, and > 10 years). Induction analyses focused on patients who received RZB 600 mg IV or PBO for 12 weeks. As all patients who entered maintenance responded to RZB IV induction, maintenance analyses were limited to those patients who responded to induction and then received RZB 360 mg SC for 52 weeks. Clinical and endoscopic outcomes were evaluated using nonresponder imputation incorporating multiple imputation to handle missing data due to impact of the COVID-19 pandemic. Safety was assessed throughout the studies. Results: The induction and maintenance analyses included 527 patients who received RZB 600 mg IV and 141 patients who received RZB 360 mg SC, respectively. At the end of induction (week 12), patients with CD duration of < 2 years achieved higher rates of endoscopic outcomes with IV RZB induction vs patients with longer durations of disease (Figure 1), and regardless of baseline CD duration, greater proportions of RZB-treated patients achieved clinical remission (defined by stool frequency and abdominal pain), endoscopic response, endoscopic remission, and ulcer-free endoscopy vs PBO (P ≤ .05). Clinical remission rates at week 12 were numerically higher in patients with CD duration of < 5 years vs > 5 years (Figure 1). Similar results for improved clinical and endoscopic outcomes associated with shorter disease duration were observed at week 52 with RZB 360 mg SC maintenance treatment (Figure 2). RZB was well tolerated with lower rates of serious adverse events and serious infections vs PBO in induction, across CD duration subgroups. Conclusion: RZB induction and maintenance therapy was effective and well tolerated with a safety profile generally similar across CD duration subgroups. Achievement of clinical and endoscopic endpoints were higher in patients with shorter duration of CD, suggesting that earlier introduction of RZB therapy may lead to improved outcomes.
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Background: Food insecurity (FI), a lack of consistent access to food, is associated with more frequent fast food intake and poor dietary quality in children. This analysis explored whether FI is associated with children's restaurant behaviors more than 6 months into the COVID-19 pandemic, a time when FI has been particularly high in the United States (US). Methods: An online survey was administered to US parents of children (4-8 years;n = 1000) in October 2020 and included sociodemographics, perceived safety of restaurant use, local food retail regulations, FI, and children's frequency of restaurant meals over the past 2 months. Multivariate regression models examined associations between the aforementioned variables and children's restaurant behaviors. Post-hoc analyses were conducted to examine if parent's COVID-specific employment changes were associated with FI, to help us understand high rates of FI in this sample. Sampling weights were applied to analyses to assure results were nationally representative. Results: Parents' perceived safety of restaurant use, income, education and employment status were associated with children's restaurant use. FI had a small, but significant association with more frequent in-person restaurant dining and more frequent restaurant delivery, but was not associated with picking up takeout. Parents' COVID-related employment changes (e.g. job loss, reduced work hours) had stronger associations with FI than more stable sociodemographic variables (e.g. parental education). Conclusions: Consistent access to food has been a pressing issue for many families throughout the pandemic. These circumstances may be associated with family restaurant behaviors that can impact children's diet quality and health. Future research should explore the burden of COVID-19 on community food systems as well as interventions and resources that can help parents access healthy food.
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To model the evolution of diseases with extended latency periods and the presence of asymptomatic patients like COVID-19, we define a simple discrete time stochastic SIR-type epidemic model. We include both latent periods as well as the presence of quarantine areas, to capture the evolutionary dynamics of such diseases. © 2020 the Author(s), licensee AIMS Press.