zoonosi respiratoria
TRANSCRIPT
Zoonosi respiratoria
DR. JORDI ROIGPneumologia
Time present & time past
are both perhaps
present in time future.
And time future
is contained in time past.
T. S. Eliot
The Four Quartets
1936
HIV / AIDS ES UNA ZOONOSI:
malaltia transmisible
d’animals a l’home en
condicions naturals
HEMORRAGIA ALVEOLAR: PERLS
Història dels Virus de la Grip “mutants”
Spanish Flu - 1918-19; pigs
– influenza A - 20-50 million deaths - WWI
Asian Flu - 1957-58; ducks/pigs China
– influenza A - 1 million deaths
Swine flu - 1976 - pigs
– influenza A, 40 million vaccinated, 1 death
Avian Flu - 1997-99 - chickens Hong Kong
– killed 6 (H5N1); 1.5 million chickens killed
Altres Virus “mutants”
Ebola - 1976 – monos a l’ Africa– 900 morts per sagnat
HIV - 1980-81- African chimps & monos – 40 million infectats; 25 million morts
Nipah virus - 1998-’99 – ratpenats a porcs - Asia– 100 morts en treballadors del porc
– no transmissió de persona a persona
SARS virus – 2003 – font animal ?
Forma de Transmissió: Associada directament
amb Aviram i Animals - China - Time
Contacte Directe amb Animals Infectats
Caça & carnisseries
Influenza Epidemics
Antigenic drift
Neurominidase
Hemagglutinin
New strains each yr
Animal reservoirs
New vaccines
formulated
Highly contagious
Epidèmia de Grip Espanyola
“Soldiers returning from the Great War
haven’t come back alone. They have
brought back a horror that will surpass the
battlefields of Europe with its deadliness.”
“Rather than threaten the very young and
the very old, this flu singles out those
between the ages of 15 and 35.”
Epidèmia de Grip Espanyola
“Spanish flu kills quickly &
inexplicably, sometime within hours.
Healthy young go to bed & never wake
up…..”
“Panic sets in. Services began to falter
as employees succumbed to the virus
or refuse to come to work. Doctors and
nurses are helpless to stem the tide….”
Epidèmia de Grip Espanyola
“In October of 1918 in NYC, a steam
shovel is used to dig trenches to
temporarily bury the bodies of the
Spanish Flu victims.”
“By the spring of 1919, it is a fading
nightmare that has left almost
50 million dead worldwide, more than
all of the casualties of the Great War.”
Transmissió Animals a Humans
Reservoris
Animal Virus
Grip Asiàtica
Anecs - Porcs
‘57-’58
Ebola
Micos
‘76
Grip porcina
Porcs
‘76
HIV
Micos
‘80-’81
Grip Aviar
Pollastres
‘97-’99
Nipah
Porcs
‘98-’99
SARS
??
2003
Grip Espanyola
Porcs
’18-’19
Armes Biològiques
Anthrax*
– spores
Smallpox*
– virus & vaccine
Plague*
– bacterial aerosol
Viruses:
– Hemorrhagic fevers
– Ebola virus
Q fever
Bacteria:
– Tularemia
– Botulinum toxin
Key Points
For all of the biological agents known to have
potential for use in bioterrorism:
– occur as natural infections
– management involves procedures similar to those
already used to manage other critically ill patients
– most are not transmitted person to person
– for the exceptions, established hospital
precaution procedures can prevent transmission:
smallpox (contact + droplet or airborne precautions)
plague pneumonia (droplet precautions)
hemorrhagic fever viruses (contact + airborne)
Anthrax
Spore outside host & bacillus in host
Spores may survive for years in soil
Organism present worldwide in soil
Host: herbivores - cattle, goats, buffalo
Disease in cattle prevented by vaccine
Not spread person to person
Anthrax Presentations
Cutaneous
Gastrointestinal
Inhalation
Anthrax Toxin = Virulence
Spores on skin, ingested or inhaled
Spores germinate to bacilli; capsule
Bacilli produce toxin (3 proteins):
– PA = protective antigen - binds host cells
(ATR)
– EF = edema factor inhibits phagocytosis
– LF = lethal factor kill macrophages, TNF
Vaccine (PA): induces antibodies to PA
Dixon, NEJM, 1999:341:815
Inhaled B. anthracis
Disease requires 8,000 - 50,000 spores
Incubation period = 1 - 5 days
Sx: fever, malaise, dry cough, SOB, sepsis
Dx: blood: Gram-stain, Ag & AB
Rx cipro, doxy, Pen G + streptomycin
Prophylaxis: cipro or doxy x 4 wks
Vaccine: 0, 2, 4 wks, 6, 12 &18 mo
Anthrax in Tissue
Lessons from Anthrax: USA
Difficult to produce small spores
Need to improve diagnostic tests
Better vaccines are needed
New antitoxin treatments of interest
Clinicians should be vigilant
Public health improvement
TABLE 1. Symptoms and signs of inhalational anthrax, laboratory-confirmed influenza, and influenza-like illness (ILI) from other causes
Inhalational Laboratory-confirmed ILI fromSymptom/Sign anthrax (n=10) influenza other causes _____________________________________________________________________
Fever or chills 100% 83%-90% 75%-89%Fatigue/malaise 100% 75%-94% 62%-94%Cough 90% 84%-93% 72%-80%Shortness of breath 80% 6% 6%Chest discomfort orpleuritic chest pain 60% 35% 23%
Headache 50% 84%-91% 74%-89% Myalgias 50% 67%-94% 73%-94%Sore throat 20% 64%-84% 64%-84%Rhinorrhea 10% 79% 68%Nausea or vomiting 80% 12% 12%_____________________________________________________________________
Modified from MMWR November 9, 2001
Pneumonic Plague:
Yersinia pestis Pneumonia
Bacterial Aerosols in
Subways, Buildings,
or Airplanes
Plague - Y. pestis
ID/IP: 100-500 orgs; 2-3 days
Sx: fever, bloody sputum, pn, sepsis
Dx: blood, sputum GS, Ag, culture, AB
Rx: Gent + doxy
Prophylaxis: doxy, Tetracyclines
Vaccine: inactivated 0, 1 & 6 mo
Precautions: droplet
History of Bacterial Plague
AD 54 - 1st plague: Egypt, Europe, Asia,
50-60% of the population died
1346 - 2nd plague: Black Death –
20-30 million deaths - 1/3 of Europeans
1855 - 3rd plague: China & India
12 million deaths
Types of Plague: Y. pestis
Enzooic infection of rodents: flea vector
Bubonic - skin lesion (bubo) with spread
to bloodstream or flea bite with Y. pestis
Pneumonic - inhaled bacterial aerosol
or infected respiratory droplet
secretions
Prairie Dog - Y. pestis
Reservoir
Plague as a Biological Weapon
Perhaps the most serious BW
Capacity for mass production
Aerosol = pneumonic plague
High fatality rate
Secondary spread from secretions
Signs: Plague Pneumonia
IP = 2-4 days; acute onset of “flu”
Signs & symptoms: The Patient
– fever >101o F, cough, bloody/watery
sputum
– breathing rapidly
– nausea, vomiting & diarrhea
Pneumonia & shock
Rapidly progressive
Viral Hemorrhagic Fevers
Hemorrhagic fevers & Ebola, Marburg
Intestinal hemorrhage, MOF
IP = 7d; fever, N&V, malaise & headache
with raised rash over entire body
Ebola: person-to-person contact
Similar Hantavirus
No Rx: mortality = 80%-90%
Brucellosis - Brucella spp.
10-100 organisms, IP 5->60 days
Sx: fever, pn, jt, cardiac or respiratory sx
Dx: blood, BM, serology & culture
Rx: doxy + rifampin or TMP-SMX
Prophylaxis: doxy + rif x 3 wks
Vaccine: none
Precautions: standand or contact
Tularemia - F. tularensis
ID/IP: 10-50 orgs: 2-10 days
Sx: ulceroglandular, typhoidal, pneumonia
Dx: blood, sputum, culture, serology
Rx: gentam.
Prophylaxis: doxy or Tetracyclines
Vaccine: inactivated single dose
Precautions: standard
Q Fever - Coxiella burnetii
ID/IP: 1-10 orgs: 10-40 days
Sx: fever, headache, myalgia, chest pains,
neurologic, skin, LFTs, FUO
Dx: EIA or serology
Rx: Tetrac., macrolides, or quinolones
Prophylaxis: doxy or Tetrac.
Vaccine: investigational in USA
- Produced by ingestion or inhalation of one of
seven serologically distinct types of botulinum
toxin, groups A-G
- Clinical illness characterized by symmetrical
cranial neuropathies and (often) dilated pupils,
followed by symmetric descending flaccid
paralysis
- No fever or sensory abnormalities
- DTRs reduced or absent
- Differential Dx includes Guillain-Barre
syndrome, myasthenia gravis, tick paralysis
BOTULISM
- Incubation period 1-5 days
- Not transmitted person-to-person - standard
precautions in hospitalized patients
- Supportive care, possible mechanical ventilation
(2-3 months)
- Prompt administration of trivalent equine
botulinum antitoxin (types A, B and E)
- Antitoxin not known to be effective
after exposure but before symptoms
BOTULISM
Claus anamnesi
Psitacosi: ocells, esplenomegàlia
FQ: boví, citolisi hepàtica
Leptospira: rosegadors + aigüa,
conjuntivitis hemorr., ictericia
Claus anamnesi
Febre botonosa: garrapates, taca
negra, rash palmoplantar, gossos
Tularèmia: caça, conills, lesió pell
Brucella: febre sudoral àlgica, llet
ovelles i cabres no controlada
MENJADOR DE CARGOLS CRUS
MISSATGES
El que no sap el que busca no
entén el que troba
Globalització: viatges, immigrants
Història epidemiològica es bàsica
–Animals, laboral, hobbies