Primary and Secondary TB

Find out how TB can cause primary disease (soon after your first infection) or secondary disease (months/years after your first infection). Rishi is a pediatric infectious disease physician and works at Khan Academy.
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video.

[@Parentstock]

10minutes video = two hours of book reading. Amazing work 🙌

[@jenychaulagain7895]

😂a kid

[@nooralhoda8529]

the best video i saw to understand primary and secondary tb infection, i've past a whole day to understand it from other sources until i found this easy and organized explanation , thanks a lot!🎩🎩🎩

[@serialreader6370]

No where on earth could you find a better explicative video than this one !

[@kevinc9006]

Wife works at a kidney dialysis center...she tested positive a week ago go chest x-rays today ...follow up tomorrow to find out what they found....this is crazy she is always happy always helping people and always kind.

[@MiaZaheeyaSofea]

he explains in all his videos humorously haha! love it, made my revisions more fun. thank you

[@manupriya9093]

Excellent!Thank you

[@MiaZaheeyaSofea]

he explains them videos so humurously..haha! love it makes me revision more fun

[@basicslime104]

You are amazing you just saved my pathology exam thank you so much.

[@doconboard4166]

Awesome.. This is the first time i am able to understand this topic With such a clarity..thanks 😊

[@jenychaulagain7895]

Hmm

[@heyhaylie01]

Khan Academy is the best! And the different colors that he uses just makes it fantastic!!!! Thanksss soo much!

[@shavisingh6393]

Great great great , it helps me a lot

[@eyeofthetiger0030]

thats so awesome, so simplified!!! TY TY TY TY

[@callumweeks]

Sahhh good to have this visual on the different prgressions of the disease. Excellent compliment to my path lecturer's cytokine detail.

[@xiaoleiqu8773]

I hope you are my professor. This is so helpful.

[@Saddamhussain-yo7mw]

Thank you man for such a nice lecture

[@kavishgoswami3355]

Awesome so simplified and easy

[@Tune_into_health_]

Wow superb understanding

[@delwarhussain8280]

thanks so much. Very good summary

[@ovtcharov7973]

what i only want to say is awesome

[@juanjosezumbaalvarado240]

I am peruano, thank you very much!!!

[@HZuckermann]

Cheesy Death! I like it, some of the youtube tutorials I've watched made by other people are so bland but you've got an interesting tone and you add a bit of humour - much more memorable! Thank you, keep up the great work.

[@longtran6605]

The video sound is pretty good, beyond my imagination

[@omarhameed]

Really good video. thanks

[@sumrar2468]

Excellent, thank you for explaining it so clearly!

[@nat7022]

really useful for revision, thanks for this

[@HafizahHoshni]

Simply excellent. Very grateful for clear, concise and well presented video. Thank you for the great channel. 9/8/2018 😊

[@farzana5725]

Thanks a lot for the wonderful video

[@sabhakhanam7864]

Thank you sir

[@hussaintashfeen4075]

Amazing video 🥰

[@hraza2222]

Thank you. How do I tell the difference between primary and secondary infection in a vignette, if they dont give the location of the lesion in the lung? I only knew child for primary and adult for secondary, but I had one question where there was an adult and i had to choose the answer for primary.
Also why does Secondary TB affect the upper lobe and not the bottom? I heard two reasons, which is correct? One is that the upper lobe has higher V/Q so more vent RELATIVE to perfusion, and the other reason was that the TB is trying to run away from the now developed immune system by going to the area of least perfusion, and doesnt care about ventilation by this point(otherwise it wudve gone to the bottom)

[@yaramahmoud9926]

Thank you!

[@calliedavies4877]

Wonderful summary!

[@railzip]

Perfect!!! I have to write a paper on this

[@charuhidhage9430]

excellent sir

[@julanaralani9353]

You are amazing thank you

[@dhlavelle]

Excellent teaching example!

[@fahadAlhulaibi]

what a fantastic explanation

[@Strawberry-cu6wr]

I cant seem to watch other videos on bio cos urs are the best

[@madeleinewinterdown3256]

How can a pt go from having clear chest films to systemic TB with positive stain, kidney and cardiac involvement and granuloma in lungs? With clear films?

[@egantrucking]

Great job!

[@skrozneobican]

This is fantastic. Thank you soo much :)

[@Dyondzie]

This was really helpful... thank you.

[@vaqasyousef6229]

What the different between active tb, primary infection secondary infection

[@rosyneo160]

Thanks this is good but u didn’t mention the milliary

[@3rM7]

Thanks ❤

[@hellomeme94]

thank you!!!

[@6thsun25]

if the bacteria are dead,like you say in 6.20,its not latent ,its eradicated.

[@Whoknowwhatweknow]

thank you

[@spraniasna2416]

Is there a video for spine TB? thank you

[@drsalmanshah165]

V good....what type of software is used in this video to draw these beautiful diagrams??

[@Joschepu]

Thanks alot!

[@mdsj1311]

Awesome

[@javierescuella3866]

May I stand unshaken

[@Mhmad_iraq]

thank you💚💚💚💚💚

[@zainabooz93]

Awesome! thank you ..

[@miss42310]

thank u =)

[@mesbah-gyne-dr]

very nice! i liked the part of chees-y death :)

[@drppenev]

Talk quicker, please. Great video.

[@kiyaramallik2550]

awesome
well explained.....

[@CHARrrrrrrrr]

I think you should add something like "TB causes death by..." just to dumb it down

[@mladjanab6322]

If a person gets a BCG vaccine (and doesnt get an infection), if they get TB later in life is it still secondary TB?

[@zangetsu949]

It became latent
Ur immunity failed to eradicate it so yess.

[@rubyirwin2008]

I have nodule in both lung 8×8 right and 11×11 left and 10 mm image 109 left one what is this my dad hade

[@samionita2008]

Darn those vengeful Bacteria 😅😅😅

[@obaidspathology1938]

Wow

[@tharukaharischandra7877]

🙏

[@THE_SHEPHERD04]

Still helping....... 2021😂🙌

[@sshko101]

This made me cough.

[@jakalmot3514]

Arthur morgan 😞

[@amitnaik630]

❤️

[@daninas.8769]

please can you translate? spanich please!

[@jeeiee_com]

Having MDR TB and watching it😥

[@gunaletchu6071]

Eat medicine.. Don't stop.. 9 months minimum.. Mighty have a lot of side effects.. But if you managed to finish the medicine.. You will come out clean..

[@aswathyks4536]

🤔

[@trustee8503]

Arthur rip

[@daninas.8769]

spanish please!

[@yesidjimenez8771]

What

[@georgeguirguis5618]

قشطة عليك يا زميلي