Bacterial toxin may fuel alcohol cravings in heavy drinkers

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 21-65; 2. Able to read and write English; 3. Meets DSM-5 criteria for current (past 6 months) alcohol use disorder; 4. Drinking criteria: Males - Drinks \> 14 drinks per week and exceeds 4 drinks per day at least twice per week; Females -Drinks \> 7 drinks per week and exceeds 3 drinks per day at least twice per week. 5. Must meet drinking criteria during a consecutive 30-day period within the 90 days prior to baseline; 6. Laboratory sessions will be scheduled such that subjects will not have major responsibilities on the following day which might limit drinking during the self-administration session (e.g., job interview, exam). 7. Negative urine pregnancy test for women. Exclusion Criteria: 1. Participants with any significant current medical conditions (neurological, cardiovascular \[including hypertension or hypotension: sitting BP \>160/100 or \<90/60mmHg at baseline screening\], endocrine, thyroid, renal, liver), seizures, delirium or hallucinations, or other unstable medical conditions including HIV; 2. Current DSM-5 substance use disorders, other than alcohol or nicotine; 3. A positive test result at intake appointment on urine drug screens conducted for illicit drugs, excluding cannabis; 4. Past 30 day use of psychoactive drugs including anxiolytics and antidepressants; 5. Women who are pregnant or nursing, or fail to use one of the following methods of birth control unless she or partner is surgically sterile or she is postmenopausal (hormone contraceptives \[oral, implant, injection, patch, or ring\], contraceptive sponge, double barrier \[diaphragm or condom plus spermicide\], or IUD); 6. Suicidal, homicidal or evidence of current (past 6-month) severe mental illness such as schizophrenia, bipolar disorder or major depression, or anxiety disorders; 7. Subjects treatment-seeking or who are currently in treatment for alcohol use; 8. Subjects with medical conditions contraindicating alcohol use (e.g., liver enzymes ≥3× normal); 9. Subjects likely to exhibit clinically significant alcohol withdrawal during the study. We will exclude subjects who a) have a history of perceptual distortions, seizures, delirium, or hallucinations upon withdrawal, or b) have a score of \> 8 on the Clinical Institute Withdrawal Assessment scale at intake appointments; 10. Participation within the past 8 weeks in other studies that involve additive blood sampling and/or interventional measures that would be considered excessive in combination with the current application. 11. Subjects \>38 on the Alcohol Use Disorders Identification Test (AUDIT) 12. Subjects with resting pulse \>100 at challenge 13. Subjects with recent (past 2 weeks) acute illness or vaccination 14. Subjects with \>Grade 2 laboratory abnormalities on screening