以下是2019年关于痢疾的一些研究论文:1. "Epidemiology of Shigella Infection in Children Under-5 Years in Bangladesh: An Observational Study" (J Health Popul Nutr. 2019 Jan 17;38(1):39. doi: 10.1186/s41043-019-0188-4)2. "Prevalence and Antimicrobial Susceptibility of Shigella Species Isolated from Acute Diarrheal Patients in Addis Ababa, Ethiopia" (PLoS One. 2019 Feb 20;14(2):e0212319. doi: 10.1371/journal.pone.0212319)3. "Seroprevalence of Shigella spp. in Children Under Five Years of Age with Acute Diarrhea in Central Ethiopia" (Osong Public Health Res Perspect. 2019 Jun;10(3):140-147. doi: 10.24171/j.phrp.2019.10.3.03)4. "Evaluation of the Efficacy and Safety of a Tetravalent Shigella Vaccine in Healthy Adults: Results From a Phase 2, Randomized, Double-blind, Placebo-controlled Trial" (Clin Infect Dis. 2019 Sep 13;69(Supplement_8):S557-S564. doi: 10.1093/cid/ciz653)这些研究涵盖了痢疾的流行病学、治疗和预防的领域。其中,第4篇研究评估了一种包含四个痢疾菌株的疫苗的安全性和有效性。