The future of Helicobacter pylori research: the agenda for microbiologists

1998 ◽  
pp. 473-482
Author(s):  
A. Lee
Author(s):  
Taishi Kayano ◽  
Ki-Deok Lee ◽  
Hiroshi Nishiura

Background. Although the seroprevalence against Helicobacter pylori (H. pylori) in Japan has declined over the birth year, Japanese people have yet exhibited a relatively high risk of gastric cancer. The present study employed mathematical models to estimate the time- and age-dependent force of infection with H. pylori in Japan, predicting the future seroprevalence by time and age. Methods. We investigated the published seroprevalence data against H. pylori in Japan from 1980–2018. Solving the McKendrick partial differential equation model, the seroprevalence was modeled as a function of survey year and age. Maximum likelihood estimation was conducted to estimate parameters governing the time- and age-dependent force of infection. Results. Among all fitted models, the time-dependent and age-independent model with an exponentially decaying force of infection over years was most favored. Fitted models indicated that the force of infection started to decrease during and/or shortly after the World War II. Using the parameterized model, the predicted fraction seropositive at the age of 40 years in 2018 was 0.22, but it is expected to decrease to 0.13 in 2030 and 0.05 in 2050, respectively. Conclusion. The time dependence was consistent with the decline in the force of infection as a function of the birth year. The force of infection has continuously and greatly declined over time, implying the diminished transmission of H. pylori through the time course and small chance of persistence. These findings are critical to anticipate the future decline in gastric cancer incidence.


Author(s):  
Majid Taati Moghadam ◽  
Zahra Chegini ◽  
Amin Norouzi ◽  
Amin Sadeghi Dosari ◽  
Aref Shariati

Background: Helicobacter pylori causes dangerous and deadly diseases such as gastric cancer and duodenal ulcers. Eradication and treatment of this bacterium are very important due to the deadly diseases caused by H. pylori and the high cost of treatment for countries. So, we present a complete list of the most important causes of failure in the treatment and eradication of H. pylori, and addresses new therapeutic methods that may be effective in controlling this bacterium in the future. Results: Many efforts have been made to control and eradicate this bacterium over the years, but no success has been achieved since its eradication is a complex process affected by the bacterial properties and host factors. Previous studies have shown that various factors are involved in failure to eradicate H. pylori, such as new genotypes of the bacterium with higher pathogenicity, inappropriate patient cooperation, mutations, biofilm formation and dormant forms that cause antibiotic resistance, acidic stomach pH, high bacterial load, smoking, immunosuppressive features and intracellular occurrence of H. pylori. On the other hand, recent studies reported that the use of probiotics, nanoparticles, antimicrobial peptides, natural product and vaccine can be helpful in the treatment and eradication of H. pylori infections. Conclusion: Eradication of H. pylori is crucial for the treatment of important diseases such as gastric cancer. Therefore, it seems that identifying the failure causes of treating this bacterium can be helpful in controlling the infections. Besides, further studies on new therapeutic strategies may help eradicate H. pylori in the future.


2016 ◽  
Vol 26 (4) ◽  
Author(s):  
Mohammad Zamani ◽  
Vahid Zamani ◽  
Javad Shokri-Shirvani

Diseases ◽  
2015 ◽  
Vol 3 (3) ◽  
pp. 122-135 ◽  
Author(s):  
Behnam Kalali ◽  
Luca Formichella ◽  
Markus Gerhard

Helicobacter ◽  
2007 ◽  
Vol 12 (s2) ◽  
pp. 64-68 ◽  
Author(s):  
David Y. Graham ◽  
Yoshio Yamaoka ◽  
Hoda M. Malaty

2018 ◽  
Vol 16 (2) ◽  
pp. 81-99 ◽  
Author(s):  
Ummay Mahfuza Shapla ◽  
Jinat Raihan ◽  
Asiful Islam ◽  
Fahmida Alam ◽  
Naeem Solayman ◽  
...  

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