CDC chart describing the major symptoms of Zika Virus in adults. (CDC.gov)
It has been a while since I have posted about Zika Virus. As the US mosquito season is peaking currently, I felt it would be appropriate to do so. Here are some important updates, based on some news articles I noticed in the past week:
- Currently in the USA, the overall Zika Virus incidence rate is much lower than it was last year. In New York for example, the current infection level is approximately 55% lower than last year at this time.
- In Central and South America, many countries are seeing a decline in Zika infections, however there are no countries where Zika Virus is disappearing. Interestingly, Argentina and Peru are seeing Zika levels increasing lately.
- It is likely that the broad declines in Zika infections within the Americas are due to an increase in the natural immunity to the virus throughout the population. Once someone has been infected with Zika once, they cannot be infected again and cannot pass the virus onto other mosquitos. These mechanisms help decrease the spread and infectivity of Zika Virus.
- Due to the sexual transmission of Zika Virus, the US government has amended their guidelines to inform Americans who have been exposed to Zika. Currently, women who have Zika symptoms should wait approximately 8 weeks before attempting to get pregnant. Men, however, should wait approximately 6 months before engaging in sex. The differences in time are due to Zika surviving longer in the testes than initially expected. (For a review of the symptoms of Zika Virus in adults, please see the graphic at the top of this post!)
- On the research front, scientists have created a mouse model to study Zika virus’ life cycle and transmission characteristics. Creating this research model is a great advancement as it will allow scientists to gain more knowledge on the virus and allow us to make advancements in the prevention of its spread and treatment.
While Zika is currently less talked about than it was last year, it is still prevalent and should not be forgotten. I’ll post more updates as the news behind Zika Virus develops.
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Yesterday afternoon, officials at the Centers for Disease Control (CDC) issued an alert for travelers heading to parts of Brazil. According to the official alert, officials in Brazil’s Ministry of Health have stated that there is an ongoing Yellow Fever outbreak that started in December of 2016. Initially in the Minas Gerais state, cases are now being seen in Sao Paulo and other surrounding areas. It is estimated that over 400 individuals have been infected thus far, with 40 confirmed deaths in humans and possibly 400 deaths in certain species of native monkeys. In an effort to fight back against the spread of this disease, Brazilian authorities are launching a widespread vaccination campaign to help immunize those who are currently unprotected. The CDC recommends that those traveling to effected areas of Brazil get vaccinated against yellow fever, or receive a booster if their last vaccination was over 10 years ago. Currently, there is a shortage of yellow fever vaccine, so getting vaccinated may take longer than usual.
Map of the Brazilian state of Minas Gerais, initial site of the current yellow fever outbreak. Brazilian officials are beginning to see yellow fever cases in neighboring Sao Paulo (v-brazil.com)
Here are some facts about Yellow Fever to help keep you informed:
- The Yellow Fever Virus (YFV) is an RNA virus of the genus Flavivirus – the same family of viruses that includes Dengue and Zika Virus
- Yellow Fever is commonly found in South America and Africa
- As with many other diseases, yellow fever virus is a vector-borne disease that is spread through the bite of an infected mosquito, either the Aedes or Haemagogus The virus can be spread to other humans if a mosquito bites an infected human and transfer virus with it while taking a blood meal.
- Most individuals who become infected with yellow fever will experience no symptoms or mild symptoms. For individuals who do experience symptoms, it usually takes between 3-6 days for them to appear after being infected. Common symptoms include:
- Sudden fever
- Severe headache
- Body aches
- Nausea / vomiting
- General weakness and fatigue
- In some cases (15%), the disease takes a severe course and includes symptoms such as high fever, jaundice, bleeding, shock, and possibly, death.
- There is no treatment for yellow fever, so hospitalized patients will receive general supportive care until the disease works its way out of the body
How to minimize your risk of contracting yellow fever:
- Get vaccinated!! Unlike other diseases in its family, the yellow fever virus vaccine is very effective at inducing immunity and does not require a booster in most cases. If you live in or are traveling to a region where yellow fever has been known to transmit, getting vaccinated is one of the best ways to remain safe
- Use mosquito repellent – repellents containing DEET, picaridin and oil of lemon eucalyptus have been proven to work the best
- Wear appropriate clothing – long sleeve tops and long pants are most effective at minimizing the amount of exposed skin that a mosquito could bite
- Avoid going outside at dusk and dawn – mosquitoes are most active during these times, so avoiding them will help minimize your risk of being bit
The Aedes mosquito, one of the species of mosquito that is involved in the transmission of yellow fever (bbc.com)
For more information, please visit:
CDC Yellow Fever Information
CDC February 1, 2017 Travel Alert
CDC Guidelines for Proper Mosquito Repellent Use
Hi Everyone! Sorry about the delay in getting this post out – since June, I have started graduate school at Rutgers New Jersey Medical School in Newark NJ. Last semester was extremely busy, but now that I am in the swing of things, I will be focusing my efforts back on Disease Detective! Going forward, I will be making relevant posts on prevalent diseases. Enjoy!
For my first post getting back into Disease Detective, I have decided to write about Heart Disease. February is American Heart Month, and with Valentine’s Day right around the corner, I figured this topic would be fitting. Below, I have some of the major facts and figures about Heart Disease.
- Heart Disease is not actually a single disease. The term “Heart Disease” is used to described several different types of heart conditions, including:
- Atherosclerosis (narrowed, stiffening blood vessels)
- Heart Failure
- Heart Attack
- Arrhythmia (many different types)
- Congenital Heart Defects
- Various Heart Valve Conditions
- Heart Disease is currently the leading cause of death for adults in the United States, with over 600,000 individuals dying each year (as of 2014). One American dies every minute from a condition classified under heart disease.
- Coronary heart disease alone kills over 365,000 Americans every year
Heart Disease Death Rates in the USA, by County (www.cdc.gov)
- Since heart disease consists of many different conditions, there is no single set of symptoms to look for. In addition, men and women can experience different symptoms for many of the same conditions. In general, the following symptoms could be signs of an underlying heart condition caused by a atherosclerotic disease,
- While it used to be considered a fatal diagnosis, Heart Disease is no longer a death sentence – many treatments exist to help patients manage their specific condition and overall health so they can continue to live long lives
- In many cases, heart disease can be treated non-invasively through the use of medications and lifestyle changes. Adopting a healthy diet, exercising regularly, and taking any prescription medications your doctor prescribes will help control your condition and improve your health. In some cases however, surgery may need to be performed to correct the condition before it becomes fatal.
For more information on Heart Disease, please visit:
American Heart Association
Mayo Clinic Heart Disease Information
CDC Heart Disease
Hi Everyone! Sorry for the delay in getting this post out. I graduated from Drew University a few weeks ago and have been busy seeing family and friends. After my short break, I am back and ready to keep you informed! Going forward, I plan to have a new disease post at regular intervals, so make sure to follow Disease Detective to keep up to date!
This week, I am writing about measles, also known as Rubeola. Measles gained popularity in the media last year when a widespread outbreak began at Disneyland California and sickened many Americans across the West coast. Below, I have outlined the major facts about measles.
- Measles is an extremely contagious disease that is caused by the measles virus.
- The measles virus is commonly spread through contact with infected body fluids and through the air via sneezing and coughing.
- Globally, measles is one of the leading causes of death for young children.
- The early symptoms of measles include fever, cough, sore throat, and a runny nose. As the disease progresses, a rash begins to spread across the body, starting on the face and neck, and extending to the rest of the body and limbs.
- No antiviral treatments exist to treat patients with measles. The standard of care for those who are sickened involves providing supportive therapy to help the body fight off the virus.
- Patients who do not receive treatment will usually die from complications as a result of the measles virus. Common complications include severe dehydration and high fever, but some severe case may be accompanied by encephalitis and pneumonia.
- Fortunately, there is an effective vaccine to protect children and adults from contracting the measles virus. The MMR vaccine (measles-mumps-rubella) is administered in two doses to children to develop immunity against the virus. The measles vaccine has been used for over 50 years and is proven to be highly effective and safe. Additionally, vaccinating a child against the measles is very affordable, costing about $1.
- The WHO has established a goal to eradicate measles by the year 2020. This goal will be reached through an international vaccine effort, coordinated by the WHO.
- Many measles outbreaks in the United States, where vaccination against measles is mandatory, arise from one of two sources – either an unvaccinated individual travels oversees and contracts the disease, bringing it home and spreading it to others who are unvaccinated; OR a foreign individual who has the measles comes to the United States and spreads the disease to unvaccinated individuals.
Stereotypical rash found on patients with the measles virus (nhs.uk)
Keep following Disease Detective to learn more about other diseases! If you have a suggestion for future topics or hear of an interesting news story about diseases that you would like me to address, please comment below!
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When thinking about what to write this week, I was torn with what to write about. One of my classmates suggested that I write about Chikungunya, as she knows it affects many Caribbean countries. Looking into Chikungunya, I also see that this disease ties in nicely with the diseases I have already blogged about because, similar to Zika, it is transmissible via mosquitos. Below, I will talk about some of the major facts about Chikungunya, and describe how it is affecting the world today…
- Chikungunya is a viral disease that was first noticed in Tanzania in 1952. When the first cases came in, this disease got its name based on one of the major symptoms that it causes. In the Kimakonde language, Chikungunya is derived from a word that means “to become distorted,” referring to the appearance of many patients.
- Chikungunya is transmitted by mosquitos, primarily the Aedes aeqypti and Aedes albopictus Interestingly, these two species are also famous for transmitting other mosquito-based diseases, such as Dengue and Zika. Once bitten by an infected mosquito, Chikungunya symptoms can set in within 4-8 days.
- The major symptoms of Chikungunya include a sudden fever with severe joint pain. In most cases, the joint pain disappears after a few days to a week, but sometimes this pain can last several months or years. Other symptoms include nausea, fatigue, muscle aches, and headaches.
- Chikungunya is difficult to diagnose based on symptoms alone, but simple blood tests can quickly and easily confirm the diagnosis.
- Unfortunately, there are currently no antiviral drugs to fight Chikungunya. When patients are identified, treatment is usually targeted at relieving symptoms. Fever and joint pain are commonly treated using standard treatments. The virus is usually cleared by the body within a week or two, but sometimes it can remain for longer.
- The best way to prevent yourself from contracting Chikungunya if you are traveling to a region with high Chikungunya levels is to take efforts to prevent mosquito bites. Wearing long-sleeve shirts, pants, and mosquito repellents are internationally accepted standards to prevent mosquito bites. In addition, using mosquito nets, or ensuring that mosquito screens are installed in any room you stay in are also effective ways to minimize your contact with mosquitos.
- Currently, Chikungunya is afflicting over 60 countries worldwide.
Where Chikungunya transmission is present, as of October 2015 (CDC.gov)
For more information:
So, it’s been a while since I first wrote about Zika Virus… Today, almost every major news outlet carried the story that the Deputy Director of the CDC publicly stated that “Zika is scarier than we initially thought.” Today alone, I noticed this quote on the front pages of many news apps and papers. Given the fear that this headline easily instills in others, I figured this would be the perfect time to break down the facts of Zika, as it is currently understood.
- Since my last Zika post, it has been shown that Zika Virus can be transmitted sexually, with 7 confirmed cases in the US mainland resulting from this.
- Zika Virus is actively spreading throughout most of South America, all of Central America, and is beginning to spread through North America, including 30 states in the US.
- Caribbean islands, especially Puerto Rico, are predicted to have a large increase in their number of Zika cases in the near future as we head into the summer months and there is increased interactions between mosquitos and humans
- The CDC is warning women who are pregnant, or who are considering becoming pregnant in the near future, to avoid traveling to regions of the world where Zika Virus is actively transmitting.
- Zika virus has been linked to an increase in the rates of microcephaly, particularly in Brazil, however not all pregnant women who contract Zika Virus will give birth to babies with deformities
- It is possible that Zika Virus is associated with an increase rate of other birth defects, including vision problems, auditory deficits, and abnormal growth
- As with many diseases, if you are infected with Zika Virus and the body fights off the infection, there is little to no risk that you will contract the virus again given your body’s immune response and memory
- The White House, as recommended by the CDC, is diverting $589 million dollars in funding that was earmarked for Ebola prevention to promote research into the Zika Virus
Map showing the countries where Zika is actively transmitting, as of April 12, 2016 (CDC.gov)
There is still much to learn about Zika Virus and the research community is examining new ways to study, diagnose, and treat Zika Virus. As more developments arise, I will definitely post more updates to keep you informed! Thanks for reading my blog, and please let me know if you have any questions or comments about any of the diseases I have talked about so far. If you have suggestions for other diseases for me to talk about, please comment them below!
Middle East Respiratory Syndrome, commonly referred to as MERS has been circulating the world lately. Before the Zika Virus outbreak in Brazil and the Ebola crisis in Africa, MERS received a lot of attention from the media because it is a relatively new disease in humans. The first human cases of MERS were seen in 2012 in Saudi Arabia. Since that time, MERS has been seen in many countries around the world. MERS is currently circulating in the Arabian Peninsula and parts of the Republic of Korea. Since 2012, there have only been 2 cases confirmed in the US, both of which originated in travelers who had traveled to a region which had a MERS outbreak.
MERS is caused by the MERS Coronavirus, known as MERS-CoV. It is believed that MERS-CoV originated in bats, but it is commonly found in camels. MERS transmits from animals to humans easily, but human to human transmission is not easily seen. MERS is fatal in many cases, especially in countries where the healthcare system is not very adequate. There is currently no vaccine to protect humans from contracting MERS, and there are no definitive treatments. To add to the difficulty in combating MERS, there are no clear diagnostic tests to allow doctors to accurately diagnose the disease in its early stages.
For More Information: