Characterization and Comparison of the Rumen Luminal and Epithelial Microbiome Profiles Using Metagenomic Sequencing Technique

Bacterial dysbiosis as a result of nutritional, bacterial, viral, and parasitic gastrointestinal infections can adversely affect the metabolism, productivity, and overall health of cattle. The purpose of this project was to characterize the commensal microbiota present in two locations of the rumen concomitantly in vivo with the animals undergoing habitual husbandry, as it was hypothesized that there are major differences in the commensal microbiota present in the two locations of the adult bovine major forestomach. A surgically fitted rumen cannula was used to allow ruminal lumen contents and mucosal biopsies to be collected from six crossbred yearling steers. In order to assess as much environmental and individual steer microbiota variation as possible, each animal was randomly sampled three times over a 3 week period. 16S rRNA sequencing was performed to provide a detailed descriptive analysis from phylum to genus taxonomic level. Significant differences were observed between luminal and epimural bacterial populations in the bovine rumen. As expected, a core microbiome composed by Firmicutes and Bacteroidetes represented over 90% of the microbiome, however, further analysis showed distinct diversity and distribution of the microbiome between the two locations. Characterizing the gastrointestinal microbiome in vivo is imperative. The novelty and the contribution of this study to the literature is the use of live cattle which allowed real-time sample collections and analysis of the rumen microbiome providing an understanding of what is normal in the live animal.

Longitudinal Analysis of the Intestinal Microbiota in the Obese Mangalica Pig Reveals Alterations in Bacteria and Bacteriophage Populations Associated With Changes in Body Composition and Diet

Due to its immunomodulatory potential, the intestinal microbiota has been implicated as a contributing factor in the development of the meta-inflammatory state that drives obesity-associated insulin resistance and type 2 diabetes. A better understanding of this link would facilitate the development of targeted treatments and therapies to treat the metabolic complications of obesity. To this end, we validated and utilized a novel swine model of obesity, the Mangalica pig, to characterize changes in the gut microbiota during the development of an obese phenotype, and in response to dietary differences. In the first study, we characterized the metabolic phenotype and gut microbiota in lean and obese adult Mangalica pigs. Obese or lean groups were created by allowing either ad libitum (obese) or restricted (lean) access to a standard diet for 54 weeks. Mature obese pigs were significantly heavier and exhibited 170% greater subcutaneous adipose tissue mass, with no differences in muscle mass compared to their lean counterparts. Obese pigs displayed impaired glucose tolerance and hyperinsulinemia following oral glucose challenge, indicating that a metabolic phenotype also manifested with changes in body composition. Consistent with observations in human obesity, the gut microbiota of obese pigs displayed altered bacterial composition. In the second study, we characterized the longitudinal changes in the gut microbiota in response to diet and aging in growing Mangalica pigs that were either limit fed a standard diet, allowed ad libitum access to a standard diet, or allowed ad libitum access to a high fat-supplemented diet over an 18-week period. As expected, weight gain was highest in pigs fed the high fat diet compared to ad libitum and limit fed groups. Furthermore, the ad libitum and high fat groups displayed significantly greater adiposity consistent with the development of obesity relative to the limit fed pigs. The intestinal microbiota was generally resilient to differences in dietary intake (limit fed vs ad libitum), though changes in the microbiota of pigs fed the high fat diet mirrored changes observed in mature obese pigs during the first study. This is consistent with the link observed between the microbiota and adiposity. In contrast to intestinal bacterial populations, bacteriophage populations within the gut microbiota responded rapidly to differences in diet, with significant compositional changes in bacteriophage genera observed between the dietary treatment groups as pigs aged. These studies are the first to describe the development of the intestinal microbiota in the Mangalica pig, and are the first to provide evidence that changes in body composition and dietary conditions are associated with changes in the microbiome of this novel porcine model of obesity.

Integrative Longitudinal Analysis of Metabolic Phenotype and Microbiota Changes During the Development of Obesity

Obesity has increased at an alarming rate over the past two decades in the United States. In addition to increased body mass, obesity is often accompanied by comorbidities such as Type II Diabetes Mellitus and metabolic dysfunction-associated fatty liver disease, with serious impacts on public health. Our understanding of the role the intestinal microbiota in obesity has rapidly advanced in recent years, especially with respect to the bacterial constituents. However, we know little of when changes in these microbial populations occur as obesity develops. Further, we know little about how other domains of the microbiota, namely bacteriophage populations, are affected during the progression of obesity. Our goal in this study was to monitor changes in the intestinal microbiome and metabolic phenotype following western diet feeding. We accomplished this by collecting metabolic data and fecal samples for shotgun metagenomic sequencing in a mouse model of diet-induced obesity. We found that after two weeks of consuming a western diet (WD), the animals weighed significantly more and were less metabolically stable than their chow fed counterparts. The western diet induced rapid changes in the intestinal microbiome with the most pronounced dissimilarity at 12 weeks. Our study highlights the dynamic nature of microbiota composition following WD feeding and puts these events in the context of the metabolic status of the mammalian host.

In vivo Microbiome Profiling of the Luminal and Mucosal Surface of the Duodenum Using a Cannulated Yearling Bovine Model

The gut microbiome provides important metabolic functions for the host animal. Bacterial dysbiosis as a result of bacterial, viral, and parasitic gastrointestinal infections can adversely affect the metabolism, productivity, and overall health. The objective of this study is to characterize the commensal microbiome present in the lumen and the mucosal surface of the duodenum of cattle, as we hypothesize that due to metabolic processes and or host proprieties, there are differences in the natural microbiota present in the mucosal surface and luminal contents of the bovine duodenum. Duodenal lumen contents and mucosal biopsies were collected from six dairy crossbred yearling steers. A flexible video-endoscope was used to harvest biopsy samples via a T shaped intestinal cannula. In order to assess as much environmental and individual steer microbiota variation as possible, each animal was sampled three times over a 6 week period. The DNA was extracted from the samples and submitted for16S rRNA gene Ion Torrent PGM bacterial sequencing. A detailed descriptive analysis from phylum to genus taxonomic level was reported. Differences in the microbiome population between two different sites within the duodenum were successfully characterized. A great and significant microbiota diversity was found between the luminal and mucosal biopsy At the phylum taxonomic level, Firmicutes, and Bacteroidetes composed over 80% of the microbiome. Further analysis at lower taxonomic levels, class, family, and genus, showed distinct diversity and distribution of the microbiome. Characterizing the gastrointestinal microbiome in vivo is imperative. The novelty of this study is the use of live cattle undergoing customary husbandry allowing real-time analysis of the duodenum microbiome contributing to the literature with respect to the bovine duodenum microbiome.

Maternal Dietary Protein Intake Influences Milk and Offspring Gut Microbial Diversity in a Rat (Rattus norvegicus) Model

Historically, investigators have assumed microorganisms identified in mother’s milk to be contaminants, but recent data suggest that milk microbiota may contribute to beneficial maternal effects. Microorganisms that colonize the gastrointestinal tracts of newborn mammals are derived, at least in part, from the maternal microbial population. Milk-derived microbiota is an important source of this microbial inocula and we hypothesized that the maternal diet contributes to variation in this microbial community. To evaluate the relationship between a mother’s diet and milk microbiome, we fed female rats a low- or high-protein diet and mated all individuals. Milk and cecal contents were collected from dams at peak lactation (14-day post-partum), and the bacterial composition of each community was assessed by 16S rRNA gene amplicon sequencing. Our findings revealed higher dietary protein intake decreased fecal microbial diversity but increased milk microbial and pup cecum diversity. Further, the higher dietary protein intake resulted in a greater abundance of potentially health-promoting bacteria, such as Lactobacillus spp. These data suggest that dietary protein levels contribute to significant shifts in the composition of maternal milk microbiota and that the functional consequences of these changes in microbial inocula might be biologically important and should be further explored.

AIDS and prehospital personnel: knowledge and prevention of occupational exposure

OBJECTIVES

Prehospital personnel, including law enforcement officers, paramedics, and fire-fighters, may be exposed to the human immunodeficiency virus (HIV) while working. This study of prehospital personnel sought to determine: 1) their knowledge of the acquired immune syndrome (AIDS) and HIV transmission; 2) the extent of AIDS training received; 3) self-assessment of risk for HIV infection; and 4) precautions adopted to reduce occupational risk of exposure to HIV.

METHODS

A survey was administered to pre-hospital personnel in a large Southern California jurisdiction. The response rate was 41% (n = 1,756) in 10 city and county departments where respondents were employed. Law enforcement officers (44%), firefighters (44%), and paramedics (12%) comprised the sample.

RESULTS

Respondents had accurate knowledge about AIDS, but incorrect perceptions about HIV transmission. A minority believed that HIV could be contracted from casual contact. Training relating to AIDS was not frequent. Preventive practices were infrequent in the work setting, with precautions used less than 50% of the time on eight of 10 measures. One-third of these prehospital personnel assessed their risk for HIV infection as medium to high, largely attributable to fear of occupational exposure.

CONCLUSIONS

Improved educational programs regarding HIV/AIDS are needed for prehospital personnel to increase the use of preventive occupational practices in the field.

HIV/AIDS knowledge and high risk sexual practices among southern California Vietnamese

OBJECTIVES

Vietnamese immigration to the U.S. since the conclusion of the Vietnam war has been substantial and in Orange County, CA, Vietnamese Americans comprise 3% of the population (the largest community in the US). Our objective was to collect data on the HIV/AIDS knowledge, attitudes and self-reported high risk behaviours within this community.

METHODS

A survey instrument was administered anonymously in Vietnamese to 532 respondents in their homes. Individuals from three population strata were randomly sampled: men 18 to 35 years old (N = 193); men 36 to 45 years old (N = 137); and women 18 to 35 years old (N = 202). Data were gathered on: (1) degree of acculturation; (2) knowledge and attitudes towards HIV/AIDS; and (3) self-reported sexual and other high risk practices.

RESULTS

Survey data indicated that 38% of respondents were very worried about themselves and 83% were worried about a family member getting AIDS. Knowledge about actual modes of HIV transmission was generally accurate, but a substantial minority still believed that HIV can be transmitted through casual contact, and 68% from needles used in hospitals. Women demonstrated less accurate knowledge than men on five key items. Quarantine of the HIV infected was agreed to by 45%. Twenty-nine percent did not believe that the epidemic would affect them personally, and 49% stated that they did not have enough information about AIDS to protect themselves. Regarding sexual practices, 31% reported never having had sex. Of the others, 8% had two or more sexual partners in the prior 12 months. No same sex behaviour was reported. Six percent of men had visited a female prostitute; of these, 24% had visited 2 or more in the prior 12 months; half of encounters in this time period were outside the US. Substantial percentages of sexually active, unmarried respondents indicated that they never use (17-40%) or only sometimes use (10-32%) condoms. Less than 1% had used injection drugs.

CONCLUSIONS

Education should be targeted at the Vietnamese community of southern California to improve knowledge that HIV cannot be contracted through casual contact, to convey information about methods for self-protection, and to reduce high risk sexual practices such as unprotected sex, sex with multiple partners and sex with prostitutes.

Targeted HIV seroprevalence among Vietnamese in southern California

OBJECTIVE

The prevalence of HIV among southern California Vietnamese is unknown. We collected seroprevalence data on targeted Vietnamese in Orange County, California who may be at risk for HIV infection.

METHODS

The assumption of elevated risk was based on rates of infection reported among other U.S. groups. Vietnamese (N = 874) from six county sites were tested during 1992: (1) attendees at county HIV/STD clinics and (2) IDU program; (3) male inmates of the county jail and (4) of a juvenile detention centre; (5) males in a driving under the influence of alcohol (DUI) remedial program; and (6) patients for nonpregnancy-related syphilis screening.

RESULTS

The number of cases detected and risk factors were: (1) county HIV/STD clinics--5/223 (2.3%), all men who had sex with men; (2) men's jail--1/122 (0.8%), risk factors unknown; (3) juvenile hall--1/145 (0.7%), risk factors unknown; (4) IDU program--0/33; (5) syphilis screening--0/284; and (6) DUI program--0/67.

CONCLUSIONS

HIV infection exists among southern California Vietnamese, and men who have sex with men appear to be at a risk for HIV infection similar to others practicing high risk behaviors in the U.S. population. Preventive education needs to be targeted explicitly at these individuals.

A national survey of public health officers' interactions with the media

OBJECTIVES

To assess the perceptions, practices, and needs of state and local health officers with respect to professional interactions with the media.

DESIGN

A survey of 759 public health officers (56 state and 703 local) on jurisdiction demographics, frequency of media interactions, agency process for media contacts, provision and need for media training, and character of media relations.

PARTICIPANTS

Fifty-two state health officers and 568 US local health officers responded, for a survey response rate of 82%.

RESULTS

Media reporting was perceived as accurate 52% to 73% of the time, although reporters were seen as needing improved technical and scientific knowledge. Media were used frequently as a component of health education. State health jurisdictions were more likely than local jurisdictions to have a media protocol and designated media contact, to internally review media releases, to interact regularly with media, and to provide staff training on media relations. Media interaction time comprised print media (63%), television (19%), and ratio (17%). One third of the health officers found media relations adversarial, but most held a positive overall view of the media. Favorable evaluation of the media was associated with high frequency of media contact, high perceived accuracy of reporting, and presence of an institutional media protocol.

CONCLUSIONS

While health officers evaluated media favorably, problem areas were identified where mutual education could improve the accuracy and value of media reporting on health issues. Training capacity for both professions should be developed to increase the effectiveness of public health in media relations.

Public health and the media in California: a survey of local health officers

Increasingly, public health interventions are dependent on effective health communications. There are, however, few data examining the relationship and interactions between local public health officers and representatives of the media in the literature. This study sought to collect data on the quality and quantity of interactions between California's 62 local health officers and the media. A survey form was sent to the health officers representing all 58 county and four city health departments in the State of California to assess the extent of media interaction, the existence of institutional media policies, the professional and personal character of media relations, the perceived accuracy of media reporting, use of the media for health education and advocacy, the availability of training in media relations for staff members, and whether media interaction facilitated or impeded achievement of public health objectives. Differences in responses according to the population of the political jurisdiction also were assessed. With 87 percent of the health officers responding, 51 percent reported 10 years or more experience interacting with the media; 65 percent said they dealt with the print media mostly on a daily, twice weekly, or weekly basis. In only 19 jurisdictions were there written policies on media relations, but in 43, media releases undergo a pre-release review. Most health officers characterized media relations as reactive, and 80 percent said they were appropriate and had an educational impact. Media interactions were largely believed to be of benefit to the public and were not generally perceived as adversarial. Health officers were of the opinion that media representatives could become more technically and scientifically knowledgeable on public health issues but also indicated that they or their own public health staff would benefit from continuing education on managing media relations. Eighty-six percent stated that the media strongly or moderately facilitate the achievement of public health objectives. Further study of this important component of public health practice is warranted.

HIV infection in the Women's Jail, Orange County, California, 1985 through 1991

The incidence and prevalence of human immunodeficiency virus (HIV) infection among injection drug users, prostitutes, and other women seeking confidential testing in the Orange County Women's Jail were assessed from 1985 to 1991. A total of 4616 voluntary tests were completed on 3051 women, and 865 women were tested repeatedly. Eighty-two women tested positively, a ratio of 1.8 positives per 100 tests or 2.7% of all persons tested. Cumulative HIV prevalence increased from 2.5% to 2.7% between 1985 and 1991, increased by age, and showed racial differences. Of women with multiple tests, 29 seroconverted. Incidence declined from 5.7 to 1.4 cases per 100 person-years of observation between 1985 and 1991. The overall rate of seroconversion was 1.6 per 100 person-years of observation.

Situational and sociodemographic characteristics of children infected with human immunodeficiency virus from pediatric sexual abuse

This study assessed the situational and sociodemographic characteristics of children infected with human immunodeficiency virus (HIV) from pediatric sexual abuse. A letter of inquiry was sent to 2147 professionals across health and social service disciplines involved with child abuse assessment, treatment, and prevention. Respondents working in programs where HIV antibody testing of abuse victims occurs and who had identified HIV infection in one or more abused children were sent a survey to assess the demographics of victims, the family/living situation where abuse occurred, alternative risks for HIV infection, bases for diagnosis of sexual abuse and for HIV antibody testing, and profiles of the perpetrator and type of abuse. Of 5622 estimated HIV antibody tests conducted during 113,198 sex abuse assessments, 28 children were infected with HIV and lacked any alternative transmission route to that of sexual abuse. A total of 41 HIV-infected children with a history of sexual abuse were identified. Thirteen cases had alternative risk factors and were excluded from analysis. Sixty-four percent of the 28 victims with sexual abuse as the sole risk factor were female and 71% were African-American. The mean age was 9 years. Coinfection with another sexually transmitted disease (STD) occurred in 9 (33%) cases. Sexual abuse was diagnosed on the basis of a victim disclosure in 21 (75%) cases. The basis for HIV antibody testing was physical findings suggestive of HIV infection in 9 (32%) cases, HIV-seropositive or high-risk perpetrator in 6 (21%) and 2 (7%) cases, respectively, and the presence of another STD in the victim in 4 (14%) cases. Perpetrators were a child's parent in 10 (42%) cases and another relative in 6 (25%) cases.(ABSTRACT TRUNCATED AT 250 WORDS)