Gram-negative bacterial infections

This study reviews medical records of about 2,700 pregnant women in Thailand who received the Pertagen® whooping cough vaccine and their babies. Researchers want to see if the vaccine is linked to any delivery complications or health issues in newborns. The goal is to confirm the…

This large Phase 3 trial is testing the safety of a new recombinant pertussis (whooping cough) vaccine in 2,399 healthy adults aged 18 to 75. Participants receive a single booster dose, and researchers monitor for side effects over 28 days. The goal is to confirm the vaccine is s…

This phase 3 study tests a new vaccine (DTacP) that protects infants from diphtheria, tetanus, and whooping cough. Around 2,900 healthy babies aged 2-3 months will receive the vaccine to check its safety and how well it triggers immunity. The trial compares different schedules an…

This study tests a single booster dose of a combined vaccine against diphtheria, tetanus, and whooping cough (dTpa) in 85 healthy Japanese adolescents aged 11 to 13. Researchers will check if the shot triggers a strong immune response and monitor for side effects one month after …

This trial compares three ways to treat Helicobacter pylori, a common stomach infection that can lead to ulcers or cancer. One approach uses genetic testing to pick antibiotics, another uses traditional sensitivity testing, and the third uses a standard fixed combination. The goa…

This study tests whether giving menstrual cups to economically vulnerable women in Kenya can lower rates of bacterial vaginosis (BV) and sexually transmitted infections (STIs). The cup is a reusable silicone device that collects menstrual blood and can be worn during sex. Researc…

This study tests two different drug combinations to treat Helicobacter pylori, a stomach bacteria that can cause indigestion. About 66 adults with dyspepsia will receive either a triple therapy (amoxicillin, clarithromycin, esomeprazole) or a quadruple therapy (bismuth, metronida…

This study tests three antibiotic regimens for scrub typhus, a bacterial infection spread by mites. Researchers compare 7 days of doxycycline, 3 days of doxycycline, and 3 days of azithromycin in 177 hospitalized patients aged 15 and older. The goal is to see which treatment clea…

This study aimed to see if communities with low levels of trachoma could stop receiving yearly azithromycin treatments without the infection coming back. Researchers planned to compare groups that continued or stopped the medicine over three years. However, the trial was withdraw…

This study planned to test a treatment called MET-2, a mix of gut bacteria, to help clear antibiotic-resistant germs from the body after a bloodstream infection. It was designed for adults not in intensive care who had a resistant infection. The trial was withdrawn before enrolli…

This study tests whether the antibiotic linezolid can effectively treat early syphilis in 24 adults. Participants have primary, secondary, or early latent syphilis, and some also have well-controlled HIV. The main goal is to see if linezolid reduces syphilis infection markers in …

This real-world study is testing two neotetracycline drugs, eravacycline and tigecycline, in 300 adults with drug-resistant Gram-negative bacterial infections. Researchers will track how well the drugs clear the infection and monitor for side effects. The goal is to see if these …

This study tests whether adding a natural substance called lignin to the usual antibiotic treatment helps more people get rid of H. pylori infection. About 70 adults with a first-time H. pylori diagnosis will take either lignin or a placebo daily for two weeks, alongside standard…

This study looks at whether the antibiotic cefiderocol can lower death rates in hospitalized adults with a tough, drug-resistant Acinetobacter infection. Researchers will compare patients who got cefiderocol to those who received the best available treatment. The goal is to see w…

This study tests whether giving antibiotics more often to entire communities can eliminate trachoma, an eye infection that can cause blindness. Over 300,000 people in Ethiopia are taking part. The goal is to see if this intensive approach works better than the current yearly trea…

This study tests a new device called the esophageal string test (EST) to diagnose H. pylori, a stomach bacteria that can cause ulcers and cancer. Participants swallow a capsule with a string inside that collects stomach fluids. Researchers compare the results to standard tests. T…

This study is testing a new rapid blood test for syphilis that gives results from a fingerstick sample during a single clinic visit. About 600 adults attending a community health centre in Winnipeg will take part. Researchers want to see if this quick test is as accurate as stand…

This study tests a new pill called TP-05 (lotilaner) to see if it can prevent Lyme disease in healthy adults who are often around ticks. The pill is already used in pets to kill ticks. Researchers will give either a low dose, high dose, or placebo to 700 volunteers and watch for …

This study tests whether taking doxycycline before potential exposure to STIs works better than taking it after exposure. 300 men who have sex with men will be randomly assigned to one of two groups and followed for 2 years. The goal is to see which approach better prevents chlam…

This study was designed to see if treating a common stomach bacteria (H. pylori) along with using a stomach acid drug could prevent ulcers caused by low-dose aspirin. It planned to enroll adults with heart or artery disease who needed long-term aspirin therapy. However, the study…

This study screens 500 adults in South Florida for H. pylori, a stomach infection that can lead to chronic gastritis, ulcers, and gastric cancer. Those who test positive receive free treatment with a three-drug combination (VOQUEZNA® Triple Pak®) for 14 days. The goal is to see i…

This study screens people in South Florida for H. pylori, a stomach infection that can lead to chronic gastritis, ulcers, and even stomach cancer. Those who test positive receive treatment, and the study compares at-home breath testing versus in-person retesting to confirm the in…

This study looks at HIV-negative people who get opportunistic infections—illnesses that usually only affect those with weak immune systems. Researchers want to find out if these patients have unusual antibodies that block a key immune signal. Up to 224 adults in Thailand and Taiw…

This study looks at genetic changes in people with H. pylori infection or stomach cancer to understand how the infection can lead to cancer. Researchers will analyze tissue samples from 110 adults undergoing endoscopy. The goal is to find early warning signs and possible ways to …

This study looks at whether a booster dose of the acellular pertussis vaccine (Tdap-IPV) can reduce the amount of whooping cough bacteria in the nose after intentional exposure. Healthy adults who were vaccinated as children will receive either the Tdap-IPV booster or a control v…

This study follows 500 children under 18 who tested positive for flu, RSV, or COVID-19. Each child takes a daily nose swab for 14 days to measure how the virus levels change over time. Researchers also check if family members get sick. The goal is to understand when kids are most…

This study is using electronic medical records from about 365,000 pregnant women in the U.S. to check the safety of the Adacel vaccine, which protects against tetanus, diphtheria, and whooping cough. Researchers will compare pregnancy and birth outcomes between women who got the …

This study follows 100 adults hospitalized in intensive care units with severe pneumonia caused by Mycoplasma or Chlamydia bacteria. Researchers will track how patients are treated, how long they stay in the hospital, and how many survive. They will also check for antibiotic resi…

This study examines how the COVID-19 pandemic affected syphilis cases and their interaction with HIV. Researchers will review medical records of 240 adults diagnosed with syphilis in Italy between 2017 and 2025. The goal is to see if pandemic restrictions led to delayed diagnoses…