Diseases caused by bacteria Questions in English

(B) Pneumonia is a respiratory disease in humans caused by pathogenic bacteria.
The two primary bacterial species responsible for causing pneumonia are:
$1$. $Streptococcus$ $pneumoniae$ (often referred to as pneumococcus).
$2$. $Haemophilus$ $influenzae$.
Therefore,the correct combination is $(ii)$ and $(iii)$.

(D) Pneumonia is a respiratory disease caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
Symptoms of pneumonia include fever, chills, cough, and headache.
In severe cases, the lips and fingernails may turn gray to bluish in color.
Difficulty in breathing and pain during breathing are also common symptoms.
Blood-stained sputum is often observed in severe infections.
Intestinal inflammation is not a symptom of pneumonia; it is typically associated with diseases like typhoid or other gastrointestinal infections.

(C) $Pneumonia$ is a bacterial disease caused by $Streptococcus$ $pneumoniae$ and $Haemophilus$ $influenzae$.
It spreads through droplets released by an infected person during coughing or sneezing, or by sharing glasses and utensils with an infected person.
Therefore, to prevent the spread of $Pneumonia$, one should avoid direct contact with an infected person or sharing their personal belongings.
Options $A$, $B$, and $D$ are preventive measures for diseases like $Dengue$ or $Malaria$ (mosquito-borne diseases), not $Pneumonia$.

(A) Typhoid fever,caused by the bacterium $Salmonella$ $typhi$,typically follows a progressive pattern.
In the first week,the fever is usually low-grade and gradually increases.
During the second week,the fever becomes more persistent and high.
By the third and fourth weeks,the fever reaches its peak intensity,often accompanied by complications like intestinal perforation if untreated.
Therefore,the fever is most severe during the third and fourth weeks.

(B) $Streptococcus$ $pneumoniae$ and $Haemophilus$ $influenzae$ are the bacteria responsible for the disease pneumonia in humans.
$1$. Pneumonia infects the alveoli (air-filled sacs) of the lungs.
$2$. As a result of the infection,the alveoli get filled with fluid leading to severe problems in respiration.
$3$. Symptoms include fever,chills,cough,and headache.
Therefore,the correct option is $B$.

(C) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
These bacteria infect the alveoli (air-filled sacs) of the lungs.
As a result of the infection, the alveoli get filled with fluid, which leads to severe problems in respiration.

(B) The incubation period for pneumonia caused by $Streptococcus$ $pneumoniae$ is typically short,ranging from $1$ to $3$ days.
This period represents the time between the initial infection by the bacteria and the appearance of the first clinical symptoms of the disease.

(A) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
It spreads mainly through the inhalation of droplets/aerosols released by an infected person, sharing glasses, or utensils with an infected person.
Therefore, it is primarily an air-borne disease spread through respiratory droplets.

(C) Pneumonia is caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
These pathogens infect the $alveoli$ (air-filled sacs) of the lungs.
As a result of the infection, the $alveoli$ get filled with fluid, which leads to severe problems in respiration.
Therefore, the correct option is $C$.

(D) Typhoid is a bacterial disease caused by $Salmonella$ $typhi$. It is transmitted through the ingestion of contaminated food and water. Houseflies act as mechanical carriers,transferring the pathogen from contaminated feces to food and water,thereby spreading the disease.

(A) $Salmonella$ $typhi$ is a pathogenic bacterium which causes typhoid fever in human beings.
These pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through blood.
Common symptoms of typhoid include high fever ($39^{\circ}C$ to $40^{\circ}C$),weakness,stomach pain,constipation,headache,and loss of appetite.

(C) $Salmonella$ $typhi$ is a pathogenic bacterium that causes typhoid fever in human beings.
These pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through the blood.
Therefore,the primary site of infection and colonization for $Salmonella$ $typhi$ is the intestinal tract.

(A) Typhoid fever,caused by the bacterium $Salmonella$ $typhi$,is a systemic infection.
Epidemiological studies indicate that typhoid is most common in the age group of $1$ to $15$ years.
This is primarily due to the higher susceptibility of children and adolescents to contaminated food and water sources,as well as developing immune systems.

(B) Typhoid fever is a systemic infection caused by the bacterium $Salmonella$ $typhi$. According to the $NCERT$ textbook,it is estimated that millions of people suffer from this disease annually. Specifically,the global burden is often cited as approximately $25$ million cases per year.

(A) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$.
It is a water-borne disease that spreads through the ingestion of food or water contaminated with the feces of an infected person.
Symptoms include high fever,weakness,stomach pain,constipation,headache,and loss of appetite.

(B) Typhoid fever is caused by the bacterium $Salmonella \text{ } typhi$.
This pathogen is transmitted through the fecal-oral route.
Houseflies $(Musca \text{ } domestica)$ act as mechanical vectors.
They sit on contaminated feces and then transfer the pathogens to food, milk, or water, which, when consumed by humans, leads to infection.

(C) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$.
These pathogens typically enter the human body through the mouth via contaminated food and water.
From the mouth,they travel to the small intestine,where they multiply and migrate to other organs through the blood.

(D) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$.
When these pathogens enter the body through contaminated food and water,they pass through the digestive tract.
They reach the small intestine first,where they penetrate the intestinal wall and migrate to other organs through the blood.

(D) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$.
These pathogens enter the small intestine through contaminated food and water.
They migrate to other organs through the blood and cause sustained high fever.
$A$ characteristic feature of severe typhoid cases is the formation of sustained lesions or ulcers in the small intestine,which can lead to intestinal perforation.

(B) $Salmonella$ $typhi$ is the pathogenic bacterium responsible for typhoid fever in humans.
The incubation period of $Salmonella$ $typhi$ typically ranges from $1$ to $3$ weeks.
This period represents the time between the entry of the pathogen into the body through contaminated food or water and the appearance of the first clinical symptoms,such as sustained high fever.

(D) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$.
Symptoms of typhoid include high fever,weakness,stomach pain,constipation,headache,and loss of appetite.
In severe cases,the patient may experience intestinal perforation and death.
$A$ characteristic clinical sign of typhoid is the enlargement of the liver and spleen (hepatosplenomegaly).
Therefore,the correct option is $D$.

(A) Typhoid fever is caused by the pathogenic bacterium $Salmonella$ $typhi$.
This pathogen enters the human body through contaminated food and water.
Once inside,it migrates to the small intestine,where it causes inflammation and ulceration.
Symptoms of typhoid include high fever,weakness,stomach pain,constipation,headache,and loss of appetite.
Therefore,both the assertion $(S)$ and the reason $(R)$ are correct,and the presence of the bacteria in the intestinal tract is the direct cause of the symptoms described in the assertion.

(A) $1$. Typhoid fever is caused by the bacterium $Salmonella \text{ } typhi$.
$2$. Since it is a bacterial infection, it can be effectively treated using antibiotics.
$3$. Therefore, the statement $(S)$ is true because antibiotics target bacterial growth, and the reason $(R)$ is true because it correctly identifies the causative agent of the disease.
$4$. Since the treatment (antibiotics) is directly linked to the causative agent (bacteria), $R$ is the correct explanation of $S$.

(C) Typhoid fever is caused by the pathogenic bacterium $Salmonella \ typhi$.
It is a bacterial disease that enters the human body through contaminated food and water.
$Salmonella \ typhi$ migrates to the small intestine and causes severe inflammation and perforation in the intestinal wall,which can be fatal.
Option $C$ is incorrect because inflammation of the alveoli is a characteristic symptom of pneumonia (caused by $Streptococcus \ pneumoniae$ or $Haemophilus \ influenzae$),not typhoid.

(C) Typhoid is caused by the bacterium $Salmonella \text{ } typhi$.
This pathogen is transmitted primarily through the ingestion of contaminated food and water.
Houseflies $(Musca \text{ } domestica)$ act as mechanical vectors by carrying the bacteria from contaminated feces or sewage to food and water sources, thereby facilitating the spread of the disease.

(B) Typhoid fever is a systemic infection caused by the bacterium $Salmonella \ typhi$.
It is primarily transmitted through the ingestion of contaminated food and water.
The pathogen enters the small intestine and migrates to other organs through the blood.
Common symptoms include high fever,weakness,stomach pain,constipation,headache,and loss of appetite.

(A) The $Widal$ test is a serological test used for the diagnosis of typhoid fever,which is caused by the bacterium $Salmonella$ $typhi$.
It detects the presence of antibodies against the $O$ and $H$ antigens of the bacteria in the patient's serum.
$ELISA$ is used for $AIDS$ detection,$Pap$ smear is used for cervical cancer screening,and $Mammography$ is used for breast cancer detection.

(A) $Salmonella$ $typhi$ is a pathogenic bacterium that causes typhoid fever in humans.
It is a Gram-negative,rod-shaped (bacillus) bacterium.
Therefore,Statement $P$ is correct.
The incubation period for typhoid fever typically ranges from $1$ to $3$ weeks,depending on the bacterial load and the host's immune response.
Therefore,Statement $Q$ is also correct.
Thus,both statements are correct.

(A) $Salmonella$ $typhi$ is a pathogenic bacterium which causes typhoid fever in human beings.
These pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through blood.
Sustained high fever ($39^{\circ}C$ to $40^{\circ}C$),weakness,stomach pain,constipation,headache,and loss of appetite are some common symptoms of this disease.

(D) The $Widal$ test is a serological test used for the diagnosis of $Typhoid$ fever,which is caused by the bacterium $Salmonella$ $typhi$.
It detects the presence of antibodies against the $O$ and $H$ antigens of the bacteria in the patient's serum.
Malaria is diagnosed by blood smear examination,Pneumonia is typically diagnosed via chest $X$-ray and clinical symptoms,and Tuberculosis is diagnosed using the $Mantoux$ test or sputum culture.

(D) Pneumonia in humans is caused by pathogenic bacteria such as $Streptococcus$ $pneumoniae$ and $Haemophilus$ $influenzae$.
These bacteria infect the alveoli (air-filled sacs) of the lungs.
As a result of the infection, the alveoli get filled with fluid leading to severe problems in respiration.
Therefore, both $(A)$ and $(B)$ are correct.

(B) The bacterium $Streptococcus$ $pneumoniae$ is commonly referred to as Pneumococcus. It is a Gram-positive,spherical bacterium that is the primary causative agent of bacterial pneumonia in humans. $Haemophilus$ $influenzae$ is another bacterium that causes pneumonia,but it is not called Pneumococcus. $Plasmodium$ is a protozoan parasite causing malaria,and $Salmonella$ is a genus of bacteria causing typhoid fever.

(C) Pneumonia is a serious respiratory disease caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
It infects the alveoli (air-filled sacs) of the lungs.
As a result of the infection, the alveoli get filled with fluid leading to severe problems in respiration.
Common cold affects the nose and respiratory passage but not the lungs.
Malaria is a protozoan disease affecting the liver and red blood cells.
Typhoid is a bacterial disease affecting the small intestine.

(A) In $Pneumonia$, the infection occurs in the alveoli of the lungs. The alveoli get filled with a fluid that is rich in proteins and cellular debris. This fluid acts as an excellent culture medium for the growth of bacteria like $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$, leading to the consolidation of the lungs.

(B) Pneumonia is a respiratory infection that causes inflammation in the air sacs of the lungs. It is particularly common and often more severe in the elderly due to a weakened immune system, making them more susceptible to pathogens like $Streptococcus \text{ } pneumoniae$. While typhoid, common cold, and malaria can affect any age group, pneumonia is frequently cited as a significant health concern specifically for the elderly population.

(C) The incubation period of $Streptococcus \text{ pneumoniae}$, the bacterium that causes pneumonia, is typically short. It ranges from $1$ to $3$ days after exposure to the pathogen. During this period, the bacteria multiply in the alveoli of the lungs, leading to the accumulation of fluid and pus, which characterizes the disease.

(C) The correct answer is $C$.
$Pneumonia$ is a respiratory disease caused by bacteria such as $Streptococcus pneumoniae$ and $Haemophilus influenzae$.
In severe cases of $Pneumonia$, the alveoli get filled with fluid leading to severe problems in respiration.
Symptoms include fever, chills, cough, and headache.
In severe cases, the lips and fingernails may turn gray to bluish in color, and the patient often experiences blood-stained sputum (hemoptysis) due to the inflammation and damage to the lung tissues.

(D) Pneumonia is a respiratory disease caused by bacteria such as $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
It spreads through the inhalation of droplets or aerosols released by an infected person during coughing or sneezing, or by sharing glasses and utensils with an infected person.
Sputum (phlegm) from the patient contains these pathogens, making it a primary medium for the transmission of the disease.
Common cold is a viral infection, Malaria is a protozoan disease spread by mosquitoes, and Cancer is a non-communicable disease.

(B) In $Pneumonia$, the alveoli of the lungs get filled with fluid, which leads to severe problems in respiration.
Due to the accumulation of fluid in the alveoli, the exchange of gases ($O_2$ and $CO_2$) is severely impaired.
As a result, the oxygen level in the blood drops significantly.
This lack of oxygen causes the lips and fingernails of the patient to turn from gray to bluish in color.

(D) Pneumonia is caused by bacteria like $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
It infects the alveoli of the lungs.
Symptoms include fever, chills, cough, headache, and in severe cases, the lips and fingernails may turn gray to bluish in color.
Pain during breathing, inflammation of the alveolar wall, and congestion of bronchioles are common symptoms.
Enlargement of the liver and spleen (hepatosplenomegaly) is $NOT$ a symptom of pneumonia; it is typically associated with diseases like typhoid or malaria.

(A) Pneumonia is a respiratory disease caused by pathogens like $Streptococcus \text{ } pneumoniae$ and $Haemophilus \text{ } influenzae$.
The infection primarily affects the alveoli of the lungs.
Symptoms include fever, chills, cough, and headache.
In severe cases, the lips and fingernails may turn gray to bluish in color.
Among the given options, the production of blood-stained sputum (often associated with severe lung congestion) is a characteristic clinical feature of pneumonia.
Option $B$ describes symptoms of typhoid, while option $C$ describes symptoms of amoebiasis.

(D) Antibiotics are chemical substances produced by some microbes which can kill or retard the growth of other disease-causing microbes.
Antibiotics have been discovered and are used effectively in the treatment of various deadly diseases including $Plague$ (caused by $Yersinia pestis$), $Diphtheria$ (caused by $Corynebacterium diphtheriae$), and $Leprosy$ (caused by $Mycobacterium leprae$).
Therefore, all the listed diseases can be treated using antibiotics.

(C) : Bacterial leaf blight of rice is caused by $Xanthomonas$ $oryzae$,a bacterium which is Gram-negative,aerobic,capsulated,and motile with a single polar flagellum.
Primary infection is carried through the infected seeds.
The entry of the pathogen occurs through wounds and stomata.
The symptoms of the disease include the appearance of linear,yellow to straw-coloured stripes,usually on both edges of the leaf.
As the disease progresses,the drying and twisting of the leaf tip occurs.
The most destructive phase of the disease is the 'kresek' or wilt resulting from early systemic infection.

(A) $Cholera$ is caused by the bacterium $Vibrio \text{ } cholerae$.
$Tetanus$ is caused by the bacterium $Clostridium \text{ } tetani$.
$Typhoid$ is caused by the bacterium $Salmonella \text{ } typhi$.
$Smallpox$ is caused by the $Variola$ virus.
$Mumps$ is caused by the $Paramyxovirus$.
$Herpes$ is caused by the $Herpes \text{ } simplex$ virus.
$Influenza$ is caused by the $Orthomyxovirus$.
Therefore, the set containing only bacterial diseases is $Cholera$ and $Tetanus$.

(D) The $Widal$ test (developed by $G.F.I. Widal$) is a serological agglutination test used to detect the presence of antibodies against the $Salmonella$ $typhi$ bacterium,which causes typhoid fever.
It is a diagnostic tool used to confirm the presence of typhoid infection in a patient by identifying specific antigens or antibodies in the blood serum.

(D) : Common cold or rhinitis is one of the most infectious diseases caused by Rhino viruses.
It affects the nose and respiratory passage but not the lungs.
It spreads by droplet infection or contaminated objects.
Pneumonia, caused by bacteria $Streptococcus$ $pneumoniae$ and $Haemophilus$ $influenzae$, is a serious disease of the lungs, in which fluid collects in the alveoli and bronchioles.
The disease spreads by the sputum of the patient.

(D) The correct answer is $D$.
Widal test (developed by $G.F.I$ Widal) is a serological agglutination test used for the diagnosis of typhoid fever.
It detects the presence of antibodies against the $Salmonella$ $typhi$ bacterium in the patient's serum.
This test helps in confirming the infection caused by $Salmonella$ $typhi$.

(A) $Salmonella$ $typhi$ is the pathogenic bacterium responsible for typhoid fever in humans.
These pathogens generally enter the small intestine through the ingestion of contaminated food and water.
After entering the small intestine,they penetrate the intestinal wall and migrate to other organs and tissues of the body through the blood circulation.
Therefore,the correct combination is contaminated food and water for the first blank and blood for the second blank.

(C) $Salmonella$ $typhi$ is a pathogenic bacterium that causes typhoid fever in human beings. These pathogens generally enter the small intestine through food and water contaminated with them and migrate to other organs through the blood. The primary site of infection and multiplication for $Salmonella$ $typhi$ is the small intestine, which often leads to sustained high fever ($39^{\circ}C$ to $40^{\circ}C$), weakness, stomach pain, constipation, headache, and loss of appetite. In severe cases, intestinal perforation and death may occur.