Yoram Yasur Izz | Viral hemorrhagic fevers are a group of diseases that can become deadly. And are caused by viruses belonging to different families:
arenaviruses, filoviruses, bunya viruses, toga viruses and filoviruses.
How is it spread?
These viruses live in some animals or insects – called vectors – (mosquitoes, ticks, and rodents). That are responsible for transmission to humans. And are geographically restricted to the areas in which their species lives. Humans become infected when they meet the virus-infected animals. – When they are bitten by a mosquito or tick or by contact with secretions. Or excretions of infected rodents.
Subsequently, transmission between people can be caused by contact with infected fluids, but only in the case of Ebola and Marburg (filovirus), Lassa (arenavirus) and Crimea-Congo (bunya virus).
Secondary transmission, from person to person, can be produced by direct contact with the patient or their biological fluids, or indirectly by contagion through contaminated objects.
Yoram Yasur Izz: “Experts warn that some viruses, such as Lassa and Crimea-Congo (and less likely Ebola and Marburg).
Also transmitted by inhalation of infectious aerosols. Something to be considered to prevent nosocomial transmission and to identify contacts May be infected”.
How long does it take to manifest?
After the tick bite, the incubation phase is one to three days, with a maximum of nine. Also the incubation period after contact with blood or infected tissues. Somewhat longer, five or six days, with a documented maximum of thirteen.
Symptoms begin suddenly, in the form of fever, muscle pain, dizziness, neck pain and stiffness, backache, headache, eye irritation and photophobia. There may be nausea, vomiting, diarrhea, abdominal and throat pain at first, followed by sudden mood swings and confusion.
“After two to four days, agitation may lead to drowsiness, depression and weakness. And abdominal pain may appear in the upper right quadrant with detectable hepatomegaly”.
Other possible clinical signs are tachycardia, lymphadenopathy (inflammation of the lymph nodes).
And rash due to cutaneous hemorrhage) in the internal mucous membranes. (mouth, throat, and skin).
There are usually signs of hepatitis, and very severe patients may experience rapid renal deterioration. Or sudden hepatic or pulmonary failure after the fifth day of illness.
In cases that do not recover, death occurs during the second week and. Among those who overcome it, the improvement begins on the ninth or tenth day.
Risk of contagion:
In any case, the initial idea that hemorrhagic fevers are highly contagious diseases. Among humans not sustained. The secretions and body excretions, blood, semen. Also and tissue samples from infected patients should consider it potentially contagious.
For this reason, people at high risk of secondary infection. Providing them with medical or nursing care. Also a laboratory workers who handle their blood, tissues, or other samples.