Microbiology Exam Review Notes

Clinical Microbiology and Pathogens

Bacterial vaginosis is treated using a combination of $klindamycyna$ and $metronidazol$. The condition known as zespół $Waterhouse-Friderichsen$ is typically caused by $Neisseria\,meningitidis$, though discussions suggest $Streptococcus\,pneumoniae$ can also be a cause. $Staphylococcus\,aureus$ is identified by the production of $toksyna\,eksfoliatywna$. Pathogens like $Bordetella\,pertussis$ and $Neisseria\,meningitidis$ have humans as their only natural host and reservoir. In the case of $S.\,pyogenes$, it is recognized as the causative agent of $róża$, while $różyca$ and $różyczka$ are distinct conditions.

$Gruźlica$ (Tuberculosis) can involve infections of the lungs ($płuc$), bones ($kości$), and the central nervous system ($ośrodkowego\,układu\,nerwowego$). The pathogen $Mycobacterium$ is characterized as being $kwasoodporna$. In newborns, meningitis ($ZOMR$) in the first days of life is commonly caused by $Streptococcus\,agalactiae$ and $Listeria$. For infections such as $mononukleoza\,zakaźna$, antibiotic therapy is not applied. Oncogenic agents mentioned include $H.\,pylori$ and $HPV$.

Diagnostics and Laboratory Methods

Bacterial identification can be performed rapidly using $MALDI-TOF\,MS$, biochemical series, or $PCR$. For $Pseudomonas$, a culture medium with $cetrymid$ is used. Samples such as blood ($krew$) and cerebrospinal fluid ($pmr$) must be transported at a temperature of $37^{\circ}C$. Diagnostic markers for $Aspergillus$ include detecting $galaktomannan$ in $BAL$ (bronchoalveolar lavage) and $surowica$ (serum). To confirm $Toxoplasma\,gondii$ in pregnant women, genetic testing or immunological tests are utilized.

Atypical bacteria are characterized by the absence of a cell wall ($ściana\,komórkowa$) and an outer membrane ($błona\,zewnętrzna$). Borreliosis testing involving the detection of $IgG$ typically requires confirmation via a $blot$ test. For staining, $Acinetobacter\,baumanii$ is discussed in the context of $Gram$ staining and the use of dyes like $fiolet\,krystaliczny$, $eozyna$, and $nigrozyna$.

Antibiotics, Resistance, and Pharmacology

Resistance in $MRSA$ is defined by the presence of a modified $PBP2$. $Enterococcus\,spp.$ exhibit natural resistance to $cefalosporyny$ (cephalosporins). For highly resistant $Klebsiella\,pneumoniae\,NDM+$, the combination of $aztreonam$ with $awibaktam$ is effective. First-line treatment for $Aspergilloza$ is $worikonazol$. $Oseltamiwir$ is classified as an antiviral drug ($przeciwwirusowy$).

$Metronidazol$ is active against organisms such as $Actinomyces\,israelii$ and $Prevotella$, but not against $Proteus\,mirabilis$. $Fluorochinolony$ work by inhibiting DNA replication. Some medications, such as $cefuroksym$, may fail to reach therapeutic concentrations in the central nervous system ($OUN$). The antibiotic $penicylina$ was famously discovered by $Fleming$.

Sterilization and Disinfection

Standard sterilization conditions include heating at $121^{\circ}C$ for $20\,min$ at a pressure of $1.5\,atm$, or dry heat at $180^{\circ}C$ for $0.5$ to $1\,godz$. Antisepsis ($antyseptyka$) differs from disinfection ($dezynfekcja$) in that it specifically pertains to the treatment of living tissues and mucous membranes ($błon\,śluzowych$). To eliminate $Clostridioides\,difficile$, agents like $kwas\,nadoctowy$ (peracetic acid) or $dwutlenek\,chloru$ (chlorine dioxide) are used, as $70\%$ alcohol is insufficient.

Questions & Discussion

Q: What is not a teratogen?
A: The discussion lists $CMV$, $Rubella$, and $Treponema\,pallidum$ as teratogens, suggesting $Chlamydia$ might be the answer to what is not teratogenic.

Q: How do we treat bacterial vaginosis?
A: The correct option was identified as $klindamycyna$ + $metronidazol$.

Q: What causes Waterhouse-Friderichsen syndrome?
A: While $Neisseria$ is the standard answer, participants noted that $Streptococcus\,pneumoniae$ and $Campylobacter\,jejuni$ were also listed as options.

Q: What do we do when IgG is detected in Borreliosis?
A: Confirm the result using a $blot$ test.

Q: What resistance is associated with modified PBP2?
A: $MRSA$.

Q: What is transported at $37^{\circ}C$?
A: Blood ($krew$) and cerebrospinal fluid ($pmr$).

Q: Where do we detect Campylobacter?
A: In stool ($kał$).

Q: What can be transmitted sexually?
A: $Chlamydia$ was specifically mentioned.

Q: What is effective against Klebsiella pneumoniae NDM+?
A: $Aztreonam$ with $awibaktam$.