Tag Archives: Biology

04.28.16
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Chikungunya

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.

chikworldmap-102015

Where Chikungunya transmission is present, as of October 2015 (CDC.gov)

For more information:

http://www.who.int/mediacentre/factsheets/fs327/en/

http://www.cdc.gov/chikungunya/

 

04.12.16
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Zika Virus Update!

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
Zika Map April 12 2016

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!

 

Read more:

http://www.usatoday.com/story/news/politics/2016/04/11/scarier-than-we-initially-thought-cdc-sounds-warning-zika-virus/82894878/

http://www.cdc.gov/zika/pregnancy/question-answers.html

 

 

04.05.16
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MERS

MERS coronavirus

MERS-CoV (ecdc.eu)

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.

camel

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:

03.14.16
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Malaria

While the news has continued to focus on new developments in the Zika Virus, another, more-widespread virus, is utilizing mosquitos as a mode of transmission. Malaria is caused by Plasmodium parasites, and is transmitted to humans by the Anopheles mosquito. The life cycle of Plasmodium parasites occurs in both mosquitos and humans.

Malaria Lifecycle

Plasmodium life cycle  (CDC.gov)

When the parasite is brought to humans by the mosquito, the parasite infects and begins causing symptoms. In mosquitos, the parasite lives without affecting the host in a negative way. As seen in the map below, malaria is most commonly noticed in central Africa, parts of Asia, and some countries in South America. Malaria is also seen in less frequent amounts throughout central and eastern Asia, central America, and parts of Mexico. Children, pregnant women, those who have compromised immune systems, and those who have never traveled to a region with Malaria are most at risk to contract the disease.

Malaria Distribution

Distribution of malaria transmission rates throughout the world (CDC.gov)

 

Malaria usually presents 7-30 days after being bitten by an infected mosquito. Many times, malaria is treatable if diagnosed quickly. The primary symptoms include fever, sweats, headaches, chills, and vomiting. As the disease progresses, generally in the next 48 hours after symptoms are first observed, symptoms can worsen, including seizures, kidney failure, hypoglycemia, blood coagulation, and severe fevers. If not treated quickly, malaria can become fatal.

Fortunately, there are treatments available for those who are diagnosed with malaria, and many are effective if started quickly after diagnosis. Many drugs focus on killing the parasite that causes malaria. While these treatments exist in the United States and other developed countries however, they are not as accessible in many of the regions that are hit the hardest by malaria.

 

For more Information:

http://www.who.int/mediacentre/factsheets/fs094/en/

http://www.cdc.gov/malaria/index.html

02.15.16
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The Problem with Under Reporting…

One of the most common problems noticed when a new disease emerges and the scientific community races to study it is the problem of under reporting. Under reporting in disease research can be seen at the case-reporting level (when local doctors incorrectly diagnose a disease and do not alert the proper authorities) or at a larger level, where whole countries do not properly understand and report the prevalence with a disease.

Under reporting can have serious consequences in infectious disease research because when scientists need to understand the severity of a disease, they will be unable to get an accurate and true picture. In the current Zika Virus outbreak in South America, one of the major problems being seen is the lack of accurate records as to the prevalence of microcephaly in children before the Zika outbreak. Scientists want to examine if there truly are more cases of microcephaly now than before, but the lack of records is proving to make the task difficult to complete.

Another example of where under reporting is proving to be a problem is in the study of Melioidosis, also known as Whitmore’s disease. Many people have never heard of this disease, (I haven’t heard of it before writing this post!!) but it is one of the most prevalent diseases spreading through many developing nations, such as India, Brazil, and other tropical areas. Melioidosis is caused by a shape-changing bacteria in contaminated soil and water, and it can infect both humans and animals. A new study, published in Nature Microbiology, estimates that this disease is under reported in 45 countries where it is known to exist, and is present in 34 more countries that do not report it yet. This is a serious problem because Melioidosis can be fatal within 48 hours of symptoms occurring. In these developing nations, where access to healthcare is limited and people live very close to one-another, this under reported disease can cause a serious problem in the future.

02.11.16
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Zika Virus – An Overview

When you turn on your TV or open a news app on your phone, you are surrounded by talks about the Zika Virus. While the news focuses on Zika Virus as it is spreading through the Americas, little is being reported on its history in the world. Earlier this week, an article written by Jon Cohen was published in Science that briefly traces the history of Zika virus from when it was first discovered to the present day. Below, I will present an overview of some of the main historical facts presented in the article to set the stage for more posts about Zika in the weeks ahead…

  • The first reports of Zika Virus occurred in April of 1947 from a group of scientists studying yellow fever in the Zika Forest in Uganda. These scientists observed a rhesus monkey with an abnormal fever. At the time, they were unsure what the virus was. The virus was isolated and injected into mice to check for the possibility of transmission.
  • A few months later, the same scientists discovered the same virus infecting the Aedes africanus Again, this virus was checked for transmission and it matched the virus isolated from the rhesus monkey. The scientists named it Zika Virus, after the Zika Forest that it was discovered in.
  • One of the first scientists to examine Zika Virus’ mechanism of transmission was William Bearcroft. Bearcroft injected himself with isolated Zika Virus and waited until he had symptoms of the disease – headaches and a slight fever. Once he noticed symptoms, Bearcroft allowed female Aedes aegypti mosquitoes to bite his left arm. He took these mosquitoes to healthy mice, allowed them to bite the mice, and later observed the symptoms of Zika in the mice. This simple experiment confirmed that Zika Virus is transmitted by mosquitoes to humans and other organisms.
  • Since these initial discoveries, Zika has not been extensively studied, as other, more pressing and emergent diseases came to light
  • The latest outbreak, currently occurring, is the largest recorded Zika outbreak. Due to the greater number of infected individuals, scientists will be able to study the virus more accurately and in greater detail.

In today’s outbreak, many news articles are detailing the correlation of Zika Virus and increased rates of microcephaly (abnormally small heads) in newborns in countries such as Brazil. While this at first sounds terrifying, it is important to realize that there is no proven link between the two observations, and it is currently only a possibility. The CDC has published a study detailing how there may be an association between Zika Virus and Microcephaly, but cautioned that prior to the Zika Virus fear, newborn head sizes were not recorded as accurately in many regions of Brazil, meaning that cases of microcephaly prior to Zika’s appearance could have slipped past the statistics. Currently, only 270 cases of suspected microcephaly have been confirmed, from the initial, newly identified 4,180 cases. Of these 270 newborns, only six were found to have the Zika Virus inside of them. It is important for this message to get out to the general public so fear and panic does not set in. While we do not know much about Zika Virus yet, it is important for the scientific community, the news media, and the general public to hold out on passing judgement until claims are proven.

For more information, visit:

http://www.sciencemag.org/news/2016/02/zika-s-long-strange-trip-limelight?utm_campaign=email-news-latest&et_rid=17103660&et_cid=263974

http://www.cdc.gov/mmwr/volumes/65/wr/mm6503e2.htm

http://medicalxpress.com/news/2016-01-brazil-microcephaly-cases.html

02.09.16
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Welcome to Disease Detective!

Welcome to Disease Detective! My name is Constantinos Bacas, and I will be your detective to separate facts from fear. Disease Detective will talk about a variety of diseases, past and present. I will look at some of the popular news media, see how they paint different stories, and find and read the articles that the news headlines are based off of. By removing the fear and reporting the facts, many of the diseases that have faced the world will not seem as scary to those without a firm understanding in the sciences. If you want to learn more about a particular disease, just comment! As long as I can find enough information to write about the disease, I will gladly post and provide you with the facts without the fear!

So, who am I? I am a senior biology major at Drew University in Madison, NJ. I have taken many advanced biology courses, including genetics, microbiology, immunology, infectious disease, and more. I am currently applying to medical school in hopes of attaining my MD. Apart from my coursework, I conduct research on the innate immune system with one of my professors. My research has allowed me to read a host of primary literature and research studies, many of which were used by the news media and spun to tell a slightly different tale. Launching Disease Detective is my way to help everyday people understand the complex world of infectious disease. I hope you enjoy!