Diagnostic Microbiology I

Course Description

Diagnostic Microbiology I focuses on the study of bacteria associated with infectious diseases, including microbial taxonomy, physiology, genetics and host-parasite relationships as they apply to clinical microbiology. It covers pathogens of particular organ systems, pathogenesis of infectious disease, clinical manifestations, etiology and epidemiology of disease, and interpretation of test results and clinical relevance are taught utilizing case studies. UWF publishes Co-requisite: MLS4460L and notes that permission is required.

Within the SCNS taxonomy, MLS is the Medical Laboratory Sciences prefix. The University of West Florida publishes this at 3 semester hours through the Department of Medical Laboratory Sciences, College of Health. Institutions carrying an integrated version offer it at approximately 4 Florida institutions.

⚠ Note the case-study method named in the description. Clinical microbiology cannot be learned as a list of organisms, because the same organism means different things in different patients and from different sites. Case-based teaching is how the interpretive judgement is built — and that judgement, not organism identification, is what the discipline actually requires.

⚠ Why this guide exists under this number

Some Florida institutions carry this material as a single integrated course with a C suffix. UWF instead runs a separate lecture and laboratory, each with its own SCNS number, and this guide documents the UWF course. ⚠ SCNS equivalency does not cross numbers, so transfer between the integrated and split forms is evaluated by hand — carry a syllabus in either direction. Note also that in this prefix a C suffix more often marks UWF's separate Professional Track than an integrated course, so the suffix alone is not a reliable guide to what a course contains.

⚠⚠ UWF runs TWO parallel MLS tracks — check which sequence you are in

• UWF publishes two distinct routes through the same subject matter. One is a split lecture-plus-laboratory sequence (for example MLS4550 with MLS4550L, MLS4625 with MLS4625L), whose prerequisites are general science courses such as PCB3063 and BCH3033. The other is a "Professional Track" of integrated 3- and 4-credit C-suffix courses (MLS4193C, MLS4221C, MLS4306C, MLS4335C, MLS4461C, MLS4463C, MLS4506C, MLS4552C, MLS4626C, MLS4631C), whose prerequisites are the MLS-internal MLS3194 and MLS3621.
• ⚠ The two tracks are not interchangeable and their prerequisites differ. A student entering through general science prerequisites lands in the split sequence; one already inside the MLS programme lands in the Professional Track.
• ⚠⚠ This is not the usual C-suffix meaning. Elsewhere in Florida, a C suffix marks an integrated lecture-plus-laboratory version of the same course. At UWF in this prefix it marks a different programme track, with different entry requirements — so reading the suffix by the statewide convention will mislead.
• Confirm with the department which sequence your programme requires before enrolling in either.

⚠ The contact-hour figure is derived — the University of West Florida publishes none

UWF's catalog publishes a credit value in semester hours, the college and department, prerequisites, co-requisites, fee notices, and a description. It does not publish contact hours, a lecture and laboratory split, or terms of offering for any course. Every contact-hour value in a UWF guide in this repository is therefore derived. The figure here applies the standard lecture convention of 15 contact hours per credit, giving 45 hours for a 3-semester-hour course. Confirm the meeting schedule with the department.

Learning Outcomes

Required Outcomes

• Describe bacterial taxonomy and classification.
• Describe bacterial cell structure and physiology.
• Describe bacterial genetics and its clinical relevance.
• Describe host-parasite relationships and normal flora.
• Describe mechanisms of bacterial pathogenesis and virulence factors.
• Describe host defences against bacterial infection.
• Describe Gram-positive cocci of clinical significance.
• Describe Gram-negative cocci and coccobacilli.
• Describe Enterobacterales and their clinical significance.
• Describe non-fermenting Gram-negative bacilli.
• Describe Gram-positive bacilli including spore formers.
• Describe anaerobic bacteria and the infections they cause.
• Describe fastidious and atypical organisms.
• Describe pathogens by organ system and site of infection.
• Describe the epidemiology of significant bacterial diseases.
• Describe specimen selection appropriate to a suspected infection.
• Describe identification strategies and algorithms.
• Describe antimicrobial agents and their mechanisms of action.
• Describe mechanisms of antimicrobial resistance.
• Interpret culture and susceptibility results in clinical context.
• Apply case-based reasoning to distinguish infection from colonisation.

Optional Outcomes

• Describe healthcare-associated infections and their prevention.
• Describe outbreak investigation and molecular typing.
• Describe emerging and re-emerging bacterial pathogens.
• Describe bioterrorism agents and laboratory response.
• Describe antimicrobial stewardship programmes.
• Describe the microbiome and its clinical significance.

Major Topics

Required Topics

• Bacterial taxonomy and classification
• Bacterial structure and physiology
• Bacterial genetics
• Host-parasite relationships and normal flora
• Pathogenesis and virulence factors
• Host defences
• Gram-positive cocci
• Gram-negative cocci and coccobacilli
• Enterobacterales
• Non-fermenting Gram-negative bacilli
• Gram-positive bacilli and spore formers
• Anaerobes
• Fastidious and atypical organisms
• Pathogens by organ system
• Epidemiology of bacterial disease
• Specimen selection
• Identification strategies
• Antimicrobial agents and mechanisms
• Antimicrobial resistance
• Case-based result interpretation

Optional Topics

• Healthcare-associated infections
• Outbreak investigation and typing
• Emerging pathogens
• Bioterrorism agents and laboratory response
• Antimicrobial stewardship
• The microbiome

Resources & Tools

• Mahon and Lehman, Textbook of Diagnostic Microbiology — the standard MLS text.
• Tille, Bailey and Scott's Diagnostic Microbiology — the reference work on the bench.
• CLSI M100 — the breakpoints, updated annually; ⚠ an old edition gives wrong answers.
• CDC infectious disease resources — free; epidemiology, current outbreaks, and treatment guidance.
• Florida Department of Health reportable disease list — free; which organisms must be reported and how quickly, in this state.
• ASM (asm.org) — free protocols and inexpensive student membership.
• Johns Hopkins ABX Guide or Sanford Guide — how clinicians actually choose antimicrobials, which is what your report feeds into.
• ASCP Board of Certification content guideline — free; microbiology is one of the largest sections.

Career Pathways

• Medical and clinical laboratory technologists and technicians — SOC 29-2011 and 29-2012; a persistent national shortage occupation, and hospital laboratories recruit continuously.
• Florida hospital systems — AdventHealth, Orlando Health, BayCare, Baptist Health, Tampa General, Jackson Health, and in UWF's own region Baptist Health Care and Ascension Sacred Heart in Pensacola.
• Reference and commercial laboratories — Quest Diagnostics and Labcorp both operate substantial Florida facilities.
• Blood centres and transfusion services — OneBlood is the major Florida blood supplier.
• Public health laboratories — the Florida Department of Health Bureau of Public Health Laboratories, which handles outbreak and reportable-disease testing.
• Molecular and genetic testing laboratories — the fastest-growing segment of the field.
• Laboratory management and supervision — SOC 11-9111 adjacent; a normal progression after several years at the bench.
• In vitro diagnostics industry — applications, technical support, and field service roles with instrument and reagent manufacturers, which typically pay more than bench work.
• Pathway to further study — medical school, physician assistant, pathology assistant, and graduate work in molecular biology or public health.
• ⚠ An honest note on the work itself. Clinical laboratory scientists are largely invisible to patients and produce the majority of the objective data on which diagnoses are made. The work is shift-based, includes nights and weekends in hospital settings, and carries real consequence — a transfusion or a critical result acted on incorrectly harms someone.

Special Information

⚠⚠ Florida licenses clinical laboratory personnel — and most states do not

• Florida is one of a small number of states that require a state licence to work as clinical laboratory personnel. Licensure is administered by the Florida Department of Health, and a national certification alone is not sufficient to practise in Florida.
• ⚠ This is the single most important regulatory fact for a Florida MLS student, and it cuts both ways: graduates of a Florida programme are prepared for it, while someone certified in a non-licensure state who moves to Florida must obtain the state licence separately.
• The usual national credential is the ASCP Board of Certification MLS credential, earned by examination after completing a programme accredited by NAACLS.
• ⚠⚠ Programmatic accreditation matters more here than institutional accreditation. Eligibility to sit the certification examination generally depends on graduating from a NAACLS-accredited programme — so confirm a programme's current accreditation status directly with NAACLS before enrolling, and be careful about assuming that transferred coursework preserves eligibility.
• Laboratory testing itself is federally regulated under CLIA, which sets personnel requirements by test complexity — the framework within which both licensure and certification sit.

⚠⚠ "Permission is required" — this course is gated on programme admission

• UWF marks this course Permission is required, and the same phrase appears on nearly every course in the MLS prefix. Meeting the listed prerequisites does not make a student eligible to enrol.
• ⚠ In practice this means admission to the Medical Laboratory Sciences programme. Clinical laboratory science programmes are cohort-based and capacity-limited, because laboratory seats and clinical placements are finite — so admission is competitive and separate from admission to the university.
• ⚠⚠ Apply to the programme early and treat its deadlines as the real constraint. A student who completes every science prerequisite and misses the cohort application waits a full year, because a cohort sequence normally starts once a year — and UWF publishes no terms of offering, so this cannot be confirmed from the catalog.
• Contact the Department of Medical Laboratory Sciences, College of Health, before planning a schedule around these courses.

⚠⚠ MLS4460 and MLS4460L are taken together

• UWF publishes an explicit Co-requisite: MLS4460 field on this entry. That is the stricter of UWF's two notations — a co-requisite conventionally means the same term, where the asterisk notation used elsewhere in the catalog also permits prior completion.
• ⚠ UWF expresses co-requisites three different ways across its catalog — an explicit Co-requisite: field, an asterisk on a prerequisite meaning may be taken prior to or during the same term, and plain prose in the description. A reader who learns only one notation will misread the others.
• Budget for the pair. The lecture and laboratory are separate enrolments with separate credit, and the laboratory carries its own fees.

⚠⚠ Infection, colonisation, contamination — the distinction the course exists to teach

• Growth is not infection. Most specimen sites carry normal flora, and reporting a colonising organism as a pathogen leads to unnecessary antibiotic treatment — harming the patient and driving resistance.
• ⚠ Site context changes everything. The same organism is normal flora at one site and a significant pathogen at another, which is why the laboratory needs to know where a specimen came from and what was suspected.
• ⚠⚠ Specimen quality determines whether the result means anything. Sputum full of squamous cells is saliva; a single positive blood culture bottle with skin flora is almost certainly contamination. Rejecting a poor specimen is better practice than reporting from it.
• Case-based reasoning is the method because the answer depends on the patient — immunocompromised, post-surgical, and community patients need different interpretations of the same growth.
• ⚠ The laboratory shapes prescribing. Selective reporting of susceptibilities is deliberate stewardship, not withholding information.

⚠ Some findings are reportable, and some are dangerous to work up

• Florida requires notification of specified organisms and diseases, some within hours. Knowing the reportable list is a professional obligation, not an administrative detail.
• ⚠⚠ Certain organisms have caused laboratory-acquired infections from routine bench work — Brucella, Francisella, and others. An unexpected slow-growing or unusual isolate should be handled in a biological safety cabinet and escalated rather than worked up on the open bench.
• Select agents are subject to federal regulation, and a laboratory that inadvertently isolates one has defined obligations.
• Florida's climate and travel volume matter epidemiologically — the state sees imported infections and vector-borne disease that laboratories elsewhere encounter rarely.

⚠⚠ Bloodborne pathogen exposure is a real occupational risk, and the controls are not optional

• Clinical laboratory work involves human blood and body fluids, which are treated as infectious regardless of the patient's known status. That is Standard Precautions, and it is the organising rule of laboratory practice.
• The OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030) is law, not guidance — it requires an exposure control plan, personal protective equipment, engineering controls, and hepatitis B vaccination offered at no cost.
• ⚠⚠ Needlestick and sharps injuries are the highest-risk exposure route. Never recap needles by hand, dispose of sharps at the point of use, and report every exposure immediately — post-exposure prophylaxis is time-critical, and the instinct to say nothing is the dangerous one.
• Aerosol generation is the underestimated route. Uncapping tubes, centrifuge accidents, and pipetting all generate aerosols; a centrifuge that is unbalanced or opened too early is a genuine hazard.
• ⚠ Programmes normally require immunisation records, a health screening, and sometimes a background check and drug screen before clinical placement. Start these early — they take longer than students expect and can delay a placement.
• Chemical hazards sit alongside the biological ones, and both belong in the same safety habit.

⚠⚠ Quality control is the discipline, not a chore attached to it

• A result is worthless without evidence that the method was performing when it was produced. That evidence is quality control, and in clinical laboratory science it is the professional skill rather than an administrative overhead.
• ⚠ Learn Levey-Jennings charts and the Westgard rules properly. They are how a laboratory distinguishes normal analytical variation from a real shift or trend, and they are examined on the ASCP board certification.
• ⚠⚠ The consequence of releasing a result from an out-of-control run is a patient managed on a wrong number. Delta checks, critical value protocols, and result verification exist because that happens and because it harms people.
• Pre-analytical error dominates. Most laboratory errors occur before the specimen reaches the analyser — wrong patient, wrong tube, haemolysis, insufficient volume, wrong order of draw — and the laboratory is frequently blamed for errors that happened at collection.
• Accuracy, precision, sensitivity, specificity and predictive value are used precisely here, not loosely. Predictive value depends on disease prevalence, which is why the same test performs differently in different populations.

Course format and position in the curriculum

• Lecture with case studies and examinations, taken with MLS4460L.
• ⚠ The volume of organism detail is large, and students who try to memorise without the organising framework of site, host, and pathogenesis find it overwhelming. Learn the reasoning and the lists follow.
• Leads to MLS4821L Diagnostic Microbiology II, the hospital rotation.
• UWF publishes no contact hours, lecture and laboratory split, or terms of offering for any course, and no fee notice appears on this entry — though MLS4460L carries both fee types. Confirm the offering pattern with the department.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement. ⚠ For clinical laboratory sciences the more important constraint is programmatic rather than numeric: courses are gated on admission to a cohort, sequenced tightly, and tied to NAACLS accreditation and to eligibility for certification — so transferring individual courses between programmes is frequently not possible even where the credit itself articulates.

MLS4460 is 3 semester hours at the University of West Florida, taken with the 1-semester-hour MLS4460L.